- Assumptions: Though impossible for ponies to have breast sizes, the equivalent occurs where Rainbow Dash is rather sensitive about her "lack of curves." Along with her tomcoltish nature, this leads to very unflattering assumptions.
- Played for Drama in A Dance on the Mats. Rainbow Dash is insecure about her lack of curves, and doesn't bring her friends to her spars with Anon out of fear they'll take his attention away from her.
- Between Friends: Before removing her bra, Star warns Marco that she is not "like Jackie". While she says she's not worried, Marco nonetheless assures her that she's perfect just the way she is.
- Between the Lines (MrQuestionMark): From Chapter 42
, Suzushina Yuriko, as referenced multiple times in the chapter, with stuttering and such:I-I've been watching my weight! I-I have! A-And my lack of breasts means there is no excess fat there so shut the hell up!
Why the hell do you have an obsession with everything south of my hips and north of my solar plexus?! Do you think it's funny to mock something that I don't have?!" - Date A Re:Live: Mana Takamiya is very annoyed by the small size of her chest (78 cm), and every time a Spirit shows up, she overreacts to how noticeable larger they are compared to her. Especially once Kotori Itsuka's body gets an Overnight Age-Up from how her Inversion happened (and Kotori’s the got the smallest breasts of the Sephira Spirits), and the revelation she's Half-Spirit yet her Spirit half hasn't amended this issue, especially when her mom( Rinne Sonogami) mentions she might never grow any bigger. No longer a worry as of the Shido Countdown arc, where she wakes up on her birthday to discover she had a huge growth spurt that's caused her breasts to become 91 cm, her joy at the revelation is clear.
- During Chapter 2 of Despair's Last Resort, Shizuka Matsuki tries to claim she doesn't have this. She fails to be convincing.
- Evangelion 303: Inverted. In chapter 15, Asuka teases Kelly about her -Kelly's- chest being too big to play rugby properly.
- Fate/Harem Antics:
- Rin Tohsaka gets annoyed by certain characters' large chests, especially her own Servant Archer/Francis Drake. She gets really pissed off when Drake brags that she already had big boobs at age 13.
- Illya is upset because she is already 18 but flat chested since her body's growth was halted. She has a mini rant that this is probably the reason why Shirou hasn't noticed her.
- "Girls Exclusive": This Hunter × Hunter smut fanfic details Gon and Killua being turned into girls by a rainbow-haired girl's Nen ability. As girls, Gon is gifted with a busty appearance while Killua is flat-chested, at first he isn't really bothered by it, but upon Gon commenting on the difference in their sizes and some experimentation, Killua gets pretty jealous and laments his small size, to even his own surprise.
- In Heart and Soul Tracey Davis is ecstatic over her new developments summer after fourth year.Tracey: Do you have any idea idea how long I've been waiting for these? I was afraid I'd never get them! And then this last term was the absolute worst because we spent so much time hanging around Susan - she's so lucky, I totally hate her.
- A source of angst for Mini Mandy of Grim Tales from Down Below once she's revived because her body cannot age.
- Hetalia: Axis Powers:
- Austria's gender-bend is portrayed this way in fanon. Austria and Liechtenstein are seen mourning about it in a webcomic on Pixiv. Also, one artist also on Pixiv drew her, Prussia, and Germany: with Germany at the big size (G Cup), Prussia at the middle size (E cup), and Austria as the small size (B cup). This is because Word of God said he applied A-Cup Angst to Liechtenstein because he saw that women in Switzerland and Austria ranked lower in breast size.
- Japan's gender-bend also gets this treatment, especially since the canon sketches of her don't exactly emphasize her assets the way sketches of many other Nyotalia nations do. In one Pixiv fanart◊, she's shown weeping about having no chest compared to the extremely well-endowed Greece's.
- In I've Got Your Back, Pearl is deeply insecure about her flat chest, as it serves as a constant reminder of an incident in her youth where she recieved a nasty web of Achey Scars across her back. It halted her puberty, and even all these years later, her body still remains misshapen.
- In Left Beyond, Cendrillon Jospin is flat-chested and feels self-conscious about it when put in a form-fitting homemade spacesuit. She considers "adding padding to help the crowdfunding campaign" that will get her into space, but ends up not doing it. Her noticeably bustier cousin Nicolette takes her place for some of the photoshoots.
- Naru-Hina Chronicles:
- Let's just say Sakura does not take it well when Sai says that her chest is small in comparison to Hinata's.
- When Arekusu sees Lee interacting with Miho for the first time, she concludes that Miho is Lee's "big-breasted girlfriend". This makes her sad as she thinks she can't compete with that. However, Miho makes it clear to Arekusu that Lee is more like a little brother to her.
- Neon Genesis Evangelion: Genocide: One of Asuka's internal monologues has her reveal that she sometimes pads her plugsuit to try and appear more developed. She's also somewhat envious of Misato's body, especially if she thinks Shinji is looking.
- The New Adventures of Invader Zim: The non-canon spinoff New Adventures: Mature Edition (which ages up the characters from the 11-12 range they are in the main story to at least 18) establishes that Gaz is almost completely flat-chested, to the point that she keeps getting mistaken for a boy. Though rather than angst, this just pisses her off.
- Kim Possible in Phantom Of Middleton gets really defensive when Bonnie offers her some of her own tops, and then mentioning they might be a little loose on her.
- Pokémon Reset Bloodlines: Implied for Lana. Her first reaction to meeting a girl named Iolani, who is rather tall and curvaceous is uttering the words "I am envious". A later sidestory has her telling her classmate Velvet Lono, who has a similar frame, that her breasts are "large and enviable".
- In Orange Rose Gathering, a fanfic that fuses elements of the above Reset Bloodlines and the fanfic Infinity Train: Blossomverse, Chloe react this way from seeing the many half-sisters of Ash, who are taller and more buxom than her despite being around the same age.
- Pride in Her Chest, a fanfic of The Loud House, has Lynn Jr. worrying about how she hasn't grown breasts yet and getting advice from her older sister Lori.
- In two Saki 4koma strips, (found here and here), it is said that the real reason Teru hates Saki is because she's angry about her making fun of her small breasts.
- In another Saki strip, found here, Kyouko becomes jealous when Kasumi uses her enormous breasts to flip over her tiles. Saki tries the same thing, but with no success.
- In another Saki strip, found here
- In Security!, Taylor Hebert is a bit insecure about her figure. Self-insert protagonist Mike Allen tries to give her a bit of self-confidence using vague future predictions.
- Tales of Faith: Cress falls under this. She would usually beat up any guy in a fit of rage should she hear them state about her chest in earshot. When it comes her comparing her chest to other females, however, Cress becomes greatly embarrassed about her small size, despite being one of the eldest females in the party.
- In Total Drama fanfic series Unbreakable Red Silken Thread While far from flat chested, Heather is somewhat self-conscious about her boob size. Her friendships with Lindsay and Jasmine don't exactly help with this, though it becomes even more apparent after Gwen shows up with some rather generous "development" since they last spoke.
- In Total Drama Legacy, Katherine often decries her small breasts. For instance, this is a Confession Cam she does after she's forced to put on Izzy's outfit for a challenge.
Katherine: I don’t have the chest for this Cleavage Window to be flattering. Oh, why was I cursed to be an A-cup?
- A source of angst for Mob in the Mob Psycho 100 gender swap fanfics Shigeko Kageyama AKA Mob and Everyone Loves Mob.
- Momoko in Wedding Peach Abridged. She inevitably is compared to her mother by her own father.
- In Voyages of the Wild Sea Horse, Nabiki Tendo and Ukyo Kuonji are often shown to feel insecure about their breast size compared to the voluptuousness of Shampoo (who likes to taunt them about it) and Ranma's female form.
- In the somewhat NSFW X-Men fanfic "What Happens In Vegas", a few days after Kitty Pryde, Piotr Rasputin and Rachel Summers have a drunken threesome, Kitty admits to her own insecurities regarding her figure. She laments to Piotr that Rachel's body would be at home on the cover of Maxim alongside Evangelista and Mary Jane Watson, while Kitty herself has what she describes as a dancer's body; "In other words, I look like two tangerines on an ironing board."
- Xenophilia features another variant of this trope with, again, Dash. When she and her human lover are discussing her previous bad luck with males, she mentions a stallion who used her for a one-night stand and then left saying he wanted a mare with "more jiggle in her rump". Pettanko mares have flat rumps but the result is the same, with all the angst and feeling ugly that would imply.
- Yet again, with a little extra help has Ghost announce an intro for fighters during the Chunin Exams. This comes up:Ghost: Let's get this started before we get any more distracted! Hyuuga Hinata a.k.a. the only Konoha kunoichi that has hit puberty so far...
Sakura and Ino: [look at Hinata then themselves and proceed to sulk in the corner]
