One key aspect to a boy being One of the Girls is that the girls do not see him as a potential Love Interest; he's "safe" as in they don't have to worry about him trying to get with any one of them or any ulterior motives. He and the girls are usually Like Brother and Sister, platonic Childhood Friends, or raised together in which the Westermarck Effect is in full force. Either way, the guy in the equation is not pushy about hooking up with his female friends. Which isn't to say that romance is not in the equation, though there will be much angsting about breaking up the friendship group.
A common plot with these types of men are their lack of male friendships and how they're seen as a "simp"note by other men. A consistent character conflict is just how "macho" they are compared to their male peers, which can be brought up by other guys, girls outside of his circle of friends, or even the very girls that he's friends with. Oftentimes, the guy in question is gay, which completely removes any romance option and the girls can just be friends with him. The gay guy is most likely to also have some Camp Gay characteristics, which will make him have a lot in common with his girl friends. A Gay Best Friend (especially if the series is more about the girls than him) usually falls in line with this flavor. But if the story makes it clear that he's into girls (which most of the time aren't part of the group, as he knows it'll ruin the dynamic) then he'll instead be Camp Straight.
The guy is always a Nice Guy or a nerd or The Quiet One, and usually makes up the "guy" part of Two Girls and a Guy if not already The One Guy in a larger group. Also seen in the Harem Genre, with non-love interests of the main male character. Said guy may become a victim of Sissy Shaming.
See One of the Boys or Fag Hag for the Distaff Counterpart.
Examples:
- Matsuri of Ayakashi Triangle is a rather literal example: The Only Friend he made before high school is a girl, and it's only after becoming female (but still seeing himself as a boy) that he made any more—three female, one male. Though he appreciates having one guy friend to talk to about certain things, Matsuri isn't bothered by the rest being girls, and was surprised when told opposite-sex friendships could be affected by (perceived) romantic tension. At the series end, Matsuri can change back but elects to stay a girl for at least the rest of high school, a major reason being that they specifically like being friends with Suzu, Yayo, and Lu as a girl.
- The Dangers in My Heart: Yamada’s friends are much more comfortable about Ichikawa’s presence than the rest of the boys, due in part to him not being an openly perverted goober. Kobayashi makes casual (albeit one-sided) conversation with him, and they’re A-okay with inviting him to their activities.
- Wakana Gojo from My Dress-Up Darling could qualify for this as well. For example, he likes very stereotypically feminine hobbies like make-up or sewing. Besides on one occasion, he says he likes watching a famous romantic tv drama and this makes him be good friends with the girls in his class and also he meets Chitose, a boy too, but who likes to do cross-dressing, and Gojo has a very positive reaction to that. The only exception to this rule is Marin with he has something more than friendship
- Roy from Pokémon Horizons: The Series is also a rather literal example. His closest friends are all girls, namely Liko and Dot. Made even more apparent at the Naranja Academy when Ann and Nemona are also close with the group. He doesn't mind, however, and gets along incredibly well with all of them.
- Kuromaru Tokisaka from UQ Holder! has No Biological Sex, although they try to identify as male. That said, Karin and Kirie have no problems with Kuromaru bathing with them and treat them as if they were female. Incidentally, later on Kuromaru actually does become female thanks to the nature of their race.
- Adventures in Alola: Jermaine is the only boy in his friend group with Lillie and Selene. He's also very close to Acerola, another girl. He doesn't mind any of this, however, and it's obvious he really values his relationships with all three girls (Ship Tease aside).
- Blood Flow: Jermaine is the only boy in his friend group with Anita and Jennifer, and they're the only people he ever hangs out with. He doesn't mind this, however, and it's clear he really values his relationships with them. Part of that is him being a Shipper on Deck for them after they each privately confide in him about their blossoming romantic feelings for each other.
- Flash Sentry in The Bridge is this in the Equestria Girls world. He'd known the girls since Kindergarten and was the one who got them into music.
- Champion Clashes: All of Jermaine's friends are girls. He doesn't mind, however, and it's clear he has good relationships with every one of them (Ship Tease aside).
- Childhood Friends (gelefant): All of Jermaine's friends (Ariel, Blossom, and Sabrina) are girls, and it's clear he has close relationships with all of them. He obviously doesn't mind this, however.
- When Karai and April have a girl's night in The Chronicles of Karai Getting Her Shit Together, they invite Mikey. April cites that it's because he is really good at doing nails.
- Diary of a Nice Guy: Greg tries to be this when he joins the feminist club, but ends up failing due to only wanting to befriend them to get into a relationship with them instead of treating them like actual people.
- Dragon Boy: All of Jermaine's friends (Bertha, Brook, Daisy, Kara, Rose, Sara, and Silver) are girls. He doesn't mind, however, and it's clear he really values his friendships with all of them (his Ship Tease and eventual Relationship Upgrade with Rose aside).
- Fairy Friends: All of Jermaine's friends (Chloe, Tootie, Trixie, and Veronica) are girls, and they're the only people he ever hangs out with. He doesn't mind this, however, and it's clear he deeply values his relationships with all of them (his Ship Tease and eventual Relationship Upgrade with Tootie and Trixie aside).
- Galar Grapples: Jermaine is the only boy in his friend group with Gloria and Marnie, and it's clear they're both his closest and only friends. He doesn't mind, however, and the three are obviously True Companions through and through (his Ship Tease with Gloria aside).
- The Gates of Friendship: Dani and Nicole are the only Duprees Jermaine befriends, and it's clear they're the sole friends he has. He doesn't mind, however, and he obviously really values his relationships with them.
- Has a Type (2022): All of Jermaine's friends (Velma, Tish, Taranee, Proxima, and Tulip) are girls, and it's clear he has close relationships with all of them. Despite Tim's teasing, Jermaine obviously doesn't mind spending time with only girls and really values his friendships with them.
- Hero Time: Jermaine is the only boy in his friend group with Hope, Julie, Kai, and Nyancy. It's clear that all four girls are both his closest and only friends. He doesn't mind this, however, and it's obvious he's good friends and great teammates with all of them (his Ship Tease and eventual Relationship Upgrade with Julie aside).
- Johto Journeys: Jermaine is the only boy in his friend group with Kris and Lyra, and it's clear they're both his closest and only friends. He doesn't mind, however, and the three are obviously True Companions through and through (Ship Tease aside).
- Let's Go, Akane-kun
has Akane Tendo waking up in an Alternate Universe where she was born a boy. To Akane's relief, he finds out that he's still friends with Yuka and Sayuri.
- The Power of Friendship (gelefant): Although Jermaine has lots of friends back in his original hometown, the only friends he makes after moving to Townsville are the Powerpuff Girls. He goes on to spend much time and become Best Friends with all three of them. He clearly doesn't mind any of this, however, and it's obvious he really values his friendship with them (his Ship Tease with Blossom aside).
- Princess Maniacs: All of Jermaine's friends (Ariel, Melody, Tiana, and Rapunzel) are girls or women. He doesn't mind, however, and it's clear he has close relationships with all of them.
- Princess Tales: All of Jermaine's Best Friends (Ariel, Tiana, Melody, and Rapunzel) are girls or women. Additionally, he spends all of his free time with both them and all of the other female royalty (and non-royalty) of Princess Academy (whether they're actually at the school in question or not). This is especially evident in "Friends in Need," "Battle of Royals," and "Alone Among the Couples." He doesn't mind any of this, however, and it's clear he really values his relationships with all of his lady friends (his former Precocious Crush on and Ship Tease with Ariel aside). It's also possible that being close friends with so many women allows him to be remarkably emotionally open with them, as evidenced by the fanfic's two examples of him unashamedly displaying Manly Tears.
- A Spectacular Spider: Jermaine is the only boy in his friend group with Gwen and MJ, and they're his only friends. He doesn't mind, however, and it's clear he has good relationships with both of them (his Ship Tease and eventual Relationship Upgrade with them aside).
- Stars and Waves: Jermaine's the only boy in his friend group with Jackie, Hekapoo, Star, and StarFan13. He doesn't mind, however, and it's clear he has good relationships with all of them (his Ship Tease and eventual Relationship Upgrade with Jackie and Star aside).
- Super Life: Helen and the Super Hero Girls are Jermaine's only friends, and they're the only people he ever hangs out with. He doesn't mind this, however, and it's clear he really values his relationships with all of them. It's also possible that being friends with so many girls allows him to be remarkably emotionally open with them as he unashamedly displays Manly Tears after the Super Hero Girls' Talking Down the Suicidal scene with him in "One Last Goodbye."
- Deconstruction in Syngenesophobia. The family has always acted like Lincoln was no different than his sisters, but they now realize they've been taking the fact they have a brother/son for granted, because regardless of how in touch with his feminine side he is, he's still a boy and will have a different attitude towards certain things than his sisters.
- Sean is this in Totally Spies: The Sean Saga, as he fits very well with the other girls, and they have no issue with him joining them in their activities. This gets slightly deconstructed when Alex points this out in "Ghosts", making Sean realize that he has no other male friends and causing him to spiral into an identity crisis of his own masculinity. It ultimately gets reconstructed when his ability to cook helps open up a witness, and he ultimately decides he has no problem with having a feminine side even as a boy.
- Unova Undertakings: Jermaine is the only boy in his friend group with Hilda and Rosa. In "The Subway Bosses," he refers to both them and Iris (also a girl) as his closest friends. He doesn't mind any of this, however, and it's clear he's both Best Friends and True Companions with all three girls (Ship Tease aside).
- You Can't Stop the Girl: Jermaine's the only boy in his friend group with Jody, June, and Ophelia. He doesn't mind, however, and it's clear he has good relationships with all of them (his Ship Tease with June aside).
- At the end of Turning Red, Mei's friend group of Abby, Priya, and Miriam expands to include Tyler, after the girls learn he's secretly a fan of their favorite boy band. He clearly expects them to make fun of him, especially since he made fun of them earlier in the film, but they're happy to invite him into their "sisterhood". In the epilogue, he's shown hanging out with them, all previous animosity forgiven.
- At the beginning of I Love You, Man, Pete is struggling to find a best man for his wedding because all of his friends are women. His search for at least one good male friend comprises the film's plot.
- Damian from Mean Girls is best friends with Janis, and even accompanies her and Cady to the girl's bathroom. At the end when the principal gathers all the girls from the school to confront the Burn Book and bullying issue, Damien has also snuck in with a hoodie and sunglasses.
- Ducky, a character from California Diaries (a Darker and Edgier The Baby-Sitters Club spinoff), is 16 years old but he mostly hangs out with the other 13-year-old girls in the series. He had a book to himself about the dichotomy of his main friend group and his two male friends, one of which is more masculine and started hanging out with a rough crowd. Ducky was later outed as gay by ghostwriter Peter Lerangis after the series ended.
- Discharge! (gelefant): All of Jermaine's friends (Blythe, Galena, Gina, Lorelle, Marina, and Nancy) are girls, and they're the only people he ever hangs out with. He doesn't mind, however, and it's clear he has good relationships with all of them (his Ship Tease and eventual Relationship Upgrade with Blythe aside).
- Earth's Scariest Monsters!: All of Jermaine's human friends (Claudia, Deborah, Isabelle, and Sylvia) are women, and they're the only non-monsters he hangs out with. Even taking his monster friends into consideration, he clearly spends more time with and is closer to Ashley, Diana, Lauren, and Nicholette than the male monsters (he also develops a close friendship with the angel Melody). He doesn't mind any of this, however, and it's obvious that he deeply values the relationships he has with all of his lady friends (his Ship Tease and eventual Relationship Upgrade with Isabelle aside). Part of all that includes him becoming just as enthusiastic and excited about Isabelle's makeover in "Womanly Charms" as the girls are.
- Glasses Girls: All of Jermaine's friends are girls or women, two of whom he develops crushes on and asks out. He doesn't mind this, however, and it's clear he has close relationships with all of them.
- Magic Hour: All of Jermaine's human friends (Clarisa, Heidi, and Ophelia) and all of his magical creature friends (Arabella, Calista, Dragonia, Eileen, Eunice, Janine, Kalila, and Meliantha) are women. He doesn't mind this, however, and it's clear he really values his relationships with all of them (his former crush on Meliantha aside). It's also possible that being friends with so many women allows him to be remarkably emotionally open with them as he twice unashamedly displays Manly Tears during the story and isn't afraid to admit that he loves the Disney Princess franchise as much as Clarisa and Ophelia do.
- The titular character from Oliver Button Is a Sissy is a young boy who loves to dance, and he attends a class where he's the only boy. The boys at his school mock him for having a girly interest and steal his tap shoes, while the girls tell them to knock it off, comfort Oliver, and give him his things back. Naturally, the boys then mock Oliver for needing a bunch of girls to stand up for him. Oliver just owns it in the end.
- Spurned into Oblivion: All three of Jermaine's closest friends (Marilyn, Mona, and Yolanda) are girls, and they're the only people he ever hangs out with. He doesn't mind, however, and it's clear he has good relationships with all of them.
- Tough Love (gelefant): All of Jermaine's friends (Lucine, Sanura, Victoria, Ambrosia, and Winona) are women, and he's the only male in their friend group. This is made even more apparent after Cordelia, another woman, shows up. He clearly doesn't mind any of this, however, and it's obvious he's close to all five Luv Monsters and really values his relationships with them. Additionally, it's implied his closeness with and trust in the Luv Monsters is at least part of the reason he goes along with them setting him up with Cordelia, who he also develops a good friendship with.
- World's Greatest Animals: All of Jermaine's human friends (Alice, Crystal, Monique, Pamela, and Polani) are women, and they're the only non-animals he regularly hangs out with. He doesn't mind this, however, and it's clear he deeply values the close relationships he has with all of them (his Ship Tease and eventual Relationship Upgrade with Crystal aside).
- Andi Mack: Cyrus's closest friends are Andi and Buffy, two girls. He is friends with two other boys, Jonah and TJ, both of them more traditionally masculine than him especially TJ who's on the basketball team. In the first case, Jonah was a crush and in the latter, TJ was gay himself. TJ mostly had male friends into typically male interests, however.
- "The Big Bang Theory: Almost literally with Raj. He behaves the most girly of all the guys and many people call him girl's names or make feminine suggestions of him.
- On one of the earliest Buffy the Vampire Slayer episodes, Willow is chagrined when Xander she's like a 'guy friend' who knows about girls (particularly since he's getting advice from her on how to click with Buffy). Later on, she's quietly pleased when Buffy tells him he's 'one of the girls' to her.
- Degrassi: The Next Generation
- Marco does have male friends; in fact, they were the ones that helped him when he first came out. As the show went on, Marco starting hanging out with his best friends Paige and Ellie (who was a beard for him for a period) more often and then lived with them briefly while attending college. He has more things in common with Paige (love of fashion, boy-crazy) than his guy friends.
- After his male best friend JT was killed, nerdy Toby became this as his remaining friends on the show in his class were all girls. Shortly after JT was killed, Toby and Liberty kissed while trying to cope with the trauma, which sets one of the other girls off and she tells Toby to take the kiss back. Toby and Liberty end it and from that point, Toby is just seen as the friend and it seems like that how he wants it.
- Eli's entire social circle during his tenure at Degrassi were girls, including his girlfriend Clare. He's an off-putting goth outcast, and he's mentioned in the past that he's been bullied for not being like the other boys.
- Camp Gay Tristan mostly hangs out with his two friends Maya and Zoe (and previously Tori, before the actress left the show). During his tenure, he was contrasted with his older brother, a stereotypical Jerk Jock and later the macho hockey team that sort of picked on him.
- Derry Girls: James hangs out with the titular girls. At first it's because he's forced to attend the all-girls' school, as he's English and there are concerns he'll be beaten up if he goes to the boys' school. However, he does seem to enjoy spending time with the group, even taking Erin to the prom. A running gag is him being Mistaken for Gay, and during his one opportunity to make friends with other guys, he drives them all away by overdoing the macho bravado. The girls do seem to consider him one of them. Michelle even calls him a "Derry Girl" when she tries to get him to stay in Northern Ireland, instead of going back to England with his Mom.
- Yoshy from Gordita Chronicles is very stereotypically feminine and his two best friends (Cucu and Ashley) are both girls.
- H₂O: Just Add Water: Lewis largely prefers the company of the girls over hanging out with any other male characters. From the few times he does interact with another boy, it's clear that he's not macho enough to enjoy it. Nate even mocks him for it, saying that Lewis is around girls so often that he acts like one too.
- House of Anubis: Fabian's closest friends in the House were always girls. Despite his strong friendship with his roommate Mick, and later Eddie, he's always been the one to spend more time with the girls than the other guys. His Establishing Character Moment lumped him with Patricia and Joy, and even after Joy left and he and Patricia temporarily stopped being friends, he started hanging out primarily with Nina and Amber, instead. Fittingly, he's the least overtly masculine of all the Anubis boys, being a Nice Guy Extreme Doormat known primarily for being sweet and dorky.
- Played With on iCarly; Freddie, the titular webshow's tech producer, is part of the Two Girls and a Guy trio with Carly and Sam. In one episode he lamented the fact that he did not have any male friends to hang with. However, as the series went on, he gained male friends as part of nerdy clubs. Also unusually for the trope, there was an underlying romantic tension between the three of them that they tried to ignore in order to not make their friendship any more complicated.
- This is more pronounced in the Sequel Series iCarly (2021) where despite their awkward romantic history, Freddie is Platonic Life-Partners with Carly, and even stated that he's been on plenty of girls' trip vacations with female friends and dislikes guys' trips.
- Katy Keene (2020): Jorge is the only male main character that's friends with all the female leads, and Katy was his Child Hood Friend. Jorge is very Camp Gay and he's also a Drag Queen and has serious issues with having to conform to traditional masculine ideals.
- She-Hulk: Attorney at Law: Jen Walters' co-worker Augustus "Pug" Pugliese seems far more comfortable around her and her paralegal Nikki than he is around any of the other men he interacts with. He happily shares a drink with them to complain about a sexist client and bonds with Nikki over their mutual love of fashion. When forced to go undercover among a group of He-Man Woman Haters, he's so uncomfortable around them that he needs Nikki to feed him things to say via an earpiece.
- Victorious: Robbie is often grouped in with the girls due to being effeminate compared to the other guys in the group. For instance, he stays in the girls' hotel room when the group visits a foreign country.
- Granblue Fantasy: Ladiva, a Campy male Draph ally with feminine behavior who often hangs out with female playable characters, especially when cooking. She also thinks that a Draph like herself doesn't have to be masculine despite their extreme musculature (remember: masculine Draphs are naturally huge). She's mostly associated with feminine pronouns, as the Japanese text has her using "Atashi" (usually used with girls) when talking about herself and the official English translation refers to Ladiva with she/her, though it's ambiguous if it's meant in the way that she's just really good at keeping up a drag Kayfabenote or she's Transgender.
- The Many Deaths of Lily Kosen: Gabriel is the only member of the friend group who is male note , even back before the group was forced to kill Lily. Interestingly, he's fairly romantically active, but never shows any romantic interest in his friends.
- In A Souls Tale, Lucas was mostly raised by his mother, and seems to prefer the company of girls like Astrid, Liz, and Sylvie rather than boys.
- QSMP: While Foolish was out on an excursion with Tina, Mouse, Jaiden, and Bad, Tina happily referred to the group as "the girlies and Bad Boy Halo." After some light protesting, Foolish accepts his role as a "girlie" with a smile.
- WitchCraft SMP: Both Joey and Scott. In spite of being the only two guys in the competition, they are civil with each other at their best, and outright hostile at worst, and their respective closest friends in the series are all women (or adjacent). Much like the creators that portray them, neither of them are interested in women either.
- Leslie from The Amazing World of Gumball is mostly friends with the girls, being seen with the other girls in Molly's treehouse in "The Pressure". He's apparently good at giving relationship advice, and it's often implied that Leslie is gay. This is also one reason why many fans mistake him for a girl.
- Ed, Edd n Eddy: Jimmy prefers to hang out with Sarah and Nazz because he has similar interests to them. One episode has him hang out with the two as opposed to going go-karting with Kevin, Jonny, and Rolf. In another episode, he's part of the cheerleading squad along with Sarah and Nazz, while all the other boys are in the football team.
- The Loud House: In "Roughin' It", Lincoln Loud realizes that he frequently hangs out with his sisters and worries they're turning him soft, leading him and Clyde to take a boys-only camping trip.
- Milo of Pepper Ann is the guy in the Two Girls and a Guy trio the main character is in. He even has A Day in the Limelight where Pepper-Ann and Nicky are busy, so he tries socialising with other guys (which it turns out he's quite awkward at — at least until he's able to explain that boys and girls aren't so different.)
- My Little Pony: Friendship Is Magic: Spike spends most of his time with the all-female Mane Six, holding especially close bonds with Twilight, Fluttershy, and Rarity. It isn't until much later in the series that he is shown spending time with other males (and even then, that group consists simply of himself, Big McIntosh and Discord, and the three of them make up the majority of regularly appearing male characters on the show).
- She-Ra and the Princesses of Power: Bow, whose only friend for a long time is Glimmer. He eventually also becomes the closest friend to Adora and gets along with the other princesses. He does also have a male friend/target of admiration, Seahawk, but his female friends vastly outnumber him. Justified as Bow is Glimmer's childhood friend and he specifically works for the Rebellion, where the strongest combatants are magical princesses. The egalitarian nature of the show also diminishes the implications of this trope in Bow's case.
- Justified in the case of Steven Universe/Steven Universe: Future: the titular character's Parental Substitutes are aliens coded as women, his best friend and later partner is a girl, and many of the people/gems that have made an impact on Steven have been female(-coded). The series is already pretty heavily dominated by female characters (the number of main male characters including Steven can be counted on one hand), though technically the gems have No Biological Sex. Steven doesn't have a complex on being/acting masculine; he's fond of the color pink, cries openly, and his greatest strength is his empathy.
- Ready Jet Go!: Because Mitchell does not have any male friends who are his age (Jet and Sean are both older than him), he hangs out with Mindy and Lillian, who gladly accept him into their circle. Mitchell isn't hypermasculine at all and embraces his feminine side. In fact, he wore Mindy's sparkly unicorn helmet in "Try and Try Again".

