In the fancomic How I Became Yours, Katara has a miscarriage. Traumatic and tragic, right? Except the thing that upsets her most (judging by what she emphasizes) is that it happened the day before her birthday. Topped off when, at the beginning of the story, Katara visits her baby's memorial on the anniversary of the miscarriage. She quickly jumps from mourning being unable to save her child to wangsting about how she can't confess her love to Zuko.
Zuko accuses Mai of this, but Mai's accusation toward him fits him better since he's the one who knocked Katara up nevermind the consequences it would have for the Fire Nation.
Sho, while retreating, declares he has a grudge against the protagonists because they drew his blood for the first time in a while instead of his sister Mai's death.
Robin calls Sasuke out on this in the DC/Naruto crossover Connecting The Dots while taunting him. When Sasuke drops into a rant about how "No one knows my pain." and losing his clan, Robin shuts him up by pointing out that in the DC universe, that is considered getting off lucky.
Sasuke: "Oh? And what about losing your entire clan? Do you know what that is like?"
Robin: "No." (shrugs) "Do you know what it's like to lose your entire planet? Your entire species? Neither do I, but I know plenty who have, and none of them are as big a loser as you are." (laughs). "So you've lost a lot. But have you ever sacrificed something? Or do you just think you deserve everything outright? Cause seriously? That's like a little baby whining for toys he can't have."
While being held hostage by Dante in Dante's Night at Freddy's, The Marionette attempts to garner his sympathy by explaining his backstory, being a child who was killed outside Fredbear's Diner and recruiting the spirits of his fellow murdered children to gain revenge. Instead, this just pisses Dante off more, since he points out that the other children weren't given a choice in the matter and are being held, against their will, as tools for Marionette's vengeance against a man they may never encounter again.
Maxima from the side story to Mare of Steel that features her; she doesn't care that her hoarding of food is causing her subjects to starve, and she doesn't care if her chosen mate loves her back or not.
Buffy feels anything Xander does in Influenced Out of Normality is about her. Xander spends time with his girlfriend? He's snubbing her. Xander wears his letterman jacket to school? He's rubbing in her face that he's more popular than her. Xander opposes her having a relationship with Angel? He's clearly jealous rather than considering the very valid concern that she'll break the curse on Angel again and release Angelus a second time. To a lesser extant this applies to how she feels about others as well. When Cordelia forgets to inform her what day picture day is, Buffy believes Cordelia did it out of spite. At one point Xander wonders if she has a victim complex.
Buffy never bothers spending time with Faith and in fact demands to know why she's at the school prom when she's homeschooled (Cordelia got Faith a date) and generally just treats Faith like a sidekick.
In "Fragments" the 10th Doctor wishes he could die without regenerating so he could be the last Doctor, treating 11 as a villain just for being the next Doctor. For this he gets transported into the body of his clone and is able to be with Rose.
A complain raised at Henry's behavior in the lost Future of Despair comic is how lots of his inner thoughts can be resumed in "me, me, me, ME", like him neglecting a baby Yarne and basically killing himself out there when his one year old son desperately needs him, all because he ~can't deal~ with Panne's death.
[Dumbledore] preferred not to share knowledge of any sort, as the more his ants knew, the more complicated they made things, and the more trouble they were to manipulate'For The Greater Good.' He'd never quite completed that phrase out in public. People always imagined the tag line 'for the greater good of the world', or 'society in general', but every time he spoke it he completed it in the privacy of his own mind the way he actually meant it, 'for the greater good of Albus Dumbledore.' It really was only fair. To his mind, the rest of wizard-kind were nothing more than bugs, deserving of pity perhaps, for not being as magnificent as he, but certainly no empathy.
In Not Quite Heroes, Dr. Drakken rants about another villain invading and robbing his lab (the same way he and Shego routinely invade and rob other people's labs), explicitly stating that this case is different "because this time it's happened to me".
Granny Hina's none too pleased that she can't force Keitaro into becoming manager of the Hinata Inn. Nor is she too thrilled with anyone else standing up to her — constantly trying to make herself out as the victim because they won't do whatever she pleases. And for all her talk about 'helping' her tenants, she still takes off to continue her grand tour ASAP, leaving Haruka in charge of her mess.
Naru's case of this is so severe that when Motoko suffers a major Humiliation Conga, she shows absolutely No Sympathy and thinks that it 'serves her right'. Not because of how Motoko's own actions led to what happened, mind. No, she's just pissed that due to Motoko losing her duel, she had to apologize for attacking Keitaro over her own mistake. She doesn't CARE that Motoko's literally lost everything because she's too hung up on the slight dent to her ego.
Kaolla Su gets into this, too. Anyone showing discomfort at her wacky antics is 'a meanie', and she helped spark an incident which led to an innocent boy getting hospitalized just because he asked her to stop harassing his sister.
In Perfection Is Overrated, many of the SUEs exhibit such behavior. Hitomi uses Mind Control to force her victims to commit horrible crimes for her amusement, then kills them afterward. Sekai uses her allies as expendable troops while planning on harvesting the Himes' powers. The Usurper expects the SUEs to serve as his pawns and advance his plan to defeat the Himes, while planning to possess the victorious SUE's body afterwards.
This bites Hitomi in the ass, as both the SU Es and the Himes will lose their most important person if their Child is destroyed. Because Hitomi was so absolutely selfish and loved no one other than herself, she died when her Child did.
The Elements of…Love?: Trixie, after witnessing Princess Twilight’s superior magical ability, acknowledges Twilight as being better at magic then her and, quite understandably, wants to become Twilight’s student in order to improve herself. Not so understandably, she insists on living in Princess Twilight’s home, assumes she’ll be waited on hoof and hoof by Twilight’s servants, and throws a fit upon realizing Twilight doesn’t have any servants (Due to Twilight herself completely averting this trope). Trixie then continuously orders Spike around like a servant despite Twilight repeatedly explaining he’s not a servant, can’t remember his name is Spike, not Spine, and presumably doesn’t care that Spike is suffering from heartbreak due to Rarity being in love with Twilight and not him.
Checker Monarch, the Big Bad of Getting Back on Your Hooves. She outright tells her minion Helping Hoof that she doesn't care who gets hurt by her actions, so long as it doesn't effect her. The Diamond Dogs she hired as her minions ultimately prove to be less selfish than she is! This stems from her Social Darwinist worldview that the strong rule the weak: since she can manipulate everyone around her with her special talent for Manipulation, she's the strongest, therefore she can do whatever she wants. Justified, as she's based off of real life sociopaths, and thus a Narcissist.
The Lullaby for a Princess song: Celestia believes she didn't notice Luna's problems because of getting caught in this very mindset.
Corona seems fully convinced that everyone's distrust and fear of her is due to lies spread by Luna rather than anything she might have done. It's kind of bizarre. She kidnaps ponies to ensure loyalty, thereby demonstrating that she knows the effect it has on others, yet she expects ponies to love her regardless. Perhaps she was hoping Stockholm Syndrome would take.
During most of Carrot Top Season, Applejack is convinced that Carrot Top is participating in the contest solely to hurt her and her family. She refuses to consider that Carrot Top might need the money to fix up her own farm - all she's concerned about is how this may harm Sweet Apple Acres.
“Carrot Top, think fer a minute!” Applejack looked flustered. “All this is gonna do is take down both of us! Dang it, ah don’t know if ya’ve got some vendetta ‘gainst ma or what, but this ain’t worth it!” It’s not about you! thought Carrot Top. and later... “No! No, of course not!” Applejack shook her head. “Ya just bet yar farm ta try ta beat ma. Carrot Top, did ah do somethin’ ta make ya mad? Is this a grudge?”
Also, just earlier, Applejack mentions that she's been considering setting up a carrot field so she can branch out. It genuinely doesn't register to her that she's openly threatening to drive Carrot Top out of her business.
It's revealed that Applejack's behavior is due to the fact that she believes with all her heart that 1) Sweet Apple Acres is perpetually on the verge of going broke and 2) that if Sweet Apple Acres ever does go broke, all of Equestria will starve to death. Nothing seems to be able to convince her that Sweet Apple Acres is flush with cash and resources and that even if it did somehow go under, there are plenty of other farms and farmers to provide for Equestria.
Naruto:Asunder: Naruto has this to say to Madara about the Uchiha/Senju feud:
"Oh I know your story. Your clan decided to start a blood feud because "Daddy" didn't take you out for ice cream. You Uchiha really need to learn how to grow up. The world is way more than about you idiots."
Cori Falls's renditions of Jessie and James are good at making each other's angst all about themselves; the two biggest examples are James in "Thorns of the Rose", when Jessie is obviously upset about something and all he can do is cry over how she supposedly doesn't love him anymore, and Jessie in "Blood on the Moon" when James's bad mood makes her weepy and insecure even after she starts chastising him for it!
First and foremost, Evil!Falla openly admits that she only cares about herself and acquiring power for herself. Even her own family comes second.
Even after accepting her role as Dark's guardian angel/mother figure, this is one of Arial's most defining traits; she constantly claims that she's looking out for Dark's best interests by trying to choose who he gets to marry, but it's obvious to anyone who's paying attention that she only cares about what she wants for him.
Sun also counts to an extent during Act VI. Despite having previously spurned Gin's Love Confession, and despite this being the first time they've even seen each other in years, Sun still fully expects that Gin will come back to her, uncaring that he's since moved on to Kokoa. Moka even takes the time to call her out on it in Act VI chapter 20. It's only after Sun pisses off Kokoa to the extent that the latter beats her into a coma, and after she comes out of said coma, that she finally grows out of it.
Yukkuris, disembodied heads made from pastry in the likeness of Touhou characters are sometimes portrayed by fans as this. Many Yukkuris would like to have an "Easy Life" where they have a good home, plenty of food and a mate with children. Most smart Yukkuris know that to have an Easy Life, they need to work hard for it and help each other but the bad selfish ones seem to think only they are entitled to have an Easy Life so other Yukkuris and humans should make their lives easy and they don't give a damn of the other's feelings. These selfish Yukkuris are very disliked by other Yukkuris and tend to suffer horrible fates especially from Humans Are Bastards.