Almost the entire Species of The Nobles in DeepRise At best everything else is inferior and unimportant compared to Nobles, at worst they're tools to be used/eaten or enemies to be wiped out.
Nimmel of Dominic Deegan sees nothing wrong with moving to another country of 'emotion crazed beast people' (his words) because his seasonal magic is strong there and he can use it to be 'the big dog on campus' and feel superior to the less magically able werewolf students. One wonders if Milov would have praised him so extensively if he knew Nimmel's real reason for staying in his home country.
Virtually everyone in 8-Bit Theater, with special mention to all the protagonists save Fighter, and also to Sarda. Bit characters get it assigned whenever it would be funny. For example, here we see Dragoon dismissing the suffering of everyone around him to mourn the loss of a spear, and in virtually every strip there's Black Mage, Red Mage or Thief hurting other people for their own gain (Thief, RM) or amusement (BM). And when the rest of the group(even Fighter)are trying to kill Black Mage late in the story:
Black Mage: If you think about it, I'm the victim here. Thief:How? Black Mage:I didn't get what I wanted.
The sentient train The Beast has this attitude, thanks to it being essentially a super-powered child whom it is nearly impossible to effectively discipline.
Most Sparks are like this; megalomania is a large part of the package. Lucrezia Mongfish takes the cake, however. After nearly destroying Europa, killing countless people and enslaving even more, killing her own son and trying to steal her daughter's body, she has the temerity to claim that she is the injured party because she didn't win, and no one came to save her from her own mistakes.
Anpu is completely unconcerned about the fact that messing with Edith's life and body may not be something she wants to happen to her, and doesn't care about anything that doesn't include his own well-being and return to power.
His adversary, Heru, is no better - at one point he stops Turner from dealing what would be a killing blow to Edith, as doing so would destroy a statue of him.
Not only was № 1 from Hell(p) arrogant enough to give himself that nickname because he is "the first person he met", but he also keeps that pattern with other people, calling them №2, №3, etc. It seems to have stuck with № 4.
In Homestuck, troll culture seems tailor-made to instil arrogance in highblooded trolls. For example, the blue-blooded Vriska tries to blame Tavros for his own disability- because knowing she caused it makes her feel bad.
Tavros: You want me to apologize. For being paralyzed.
Vriska really is the most supreme example in the whole comic; literally everything she does through out the comic is just an attempt to put herself in the spotlight and make the story revolve around her. She puts herself into every imaginable conflict, goal, and scheme even if they conflict with one another, just for the sake of showing off how many irons she has in the fire. Her narcissism and belief in her own perfection is so extreme that when she's confronted with an alternate version of herself that's gone through Character Development and become a whole different person, Vriska accuses said alternate self of being a loser and violently bullies her for not being like Vriska.
God in Jack (David Hopkins) has this view of the entire universe, in an emotionally-abusive flavor of the trope. Her whole reasoning behind creating that universe's incarnation of Jesus Christ is essentially because she wanted to be able to say that she suffered more than anyone else anywhere ever, and whenever anyone has a problem with the utterly unfair, cruel, irresponsible laws that negate free will, punish the good, and reward the wicked, she immediately responds by saying that as much as it hurts, it hurts her even more to see others in pain... and if you don't forgive her for any part of that, well, that's holding onto your anger, which will get you sent to Hell.
Least I Could Do: Rayne Summers suffers from this, and at one point had to get his friend to explain said friend's impending wedding in a way that makes it about him.
Ménage à 3 has at least two fully-fledged egomaniacs:
International fashion model Senna suffers from comedy-level vanity. She takes Sandra off to Brazil on a drunken spree, and then shows little interest in Sandra's situation until Sandra kicks up a fuss. When she then employs Sandra, she treats her as a lowly minion. And when she returns to Montreal, she visits Matt and then Gary in search of sympathy for her recent setbacks, laughs off Gary's suggestions for their date as of no interest to herself, and then hauls him onto a flight to Paris, largely ignoring his evident discomfort about flying. She's quite fun to be around, and she can be polite enough, in a casual way, to people she finds attractive or amusing, but there's little evidence of her caring very much about anyone else.
Yuki is just incredibly self-centered. For example, when DiDi tries to tell her that she wants Gary, Yuki first thinks that DiDi is in love with her, then somehow concludes that DiDi has the same problem (phallophobia) as herself. And after Gary starts giving her his incredibly effective cunnilingus technique, the Swirly-Go-Round, she has him do it multiple times in one day, never thinking to return any kind of physical affection until called on this by Sonya.
morphE features Billy Thatcher. A chess grandmaster and television star. This obviously means that he is the only one of the kidnapped mages who needs to get back to his regular life. He refuses to care about the plight of the other captives of whom he assumes are idiots and cowards.
Muh Phoenix: Scarlet Witch thinks she's the true victim of House of M, because despite going insane, killing people and bringing mutantkind near extinction, nobody cared about how she felt.
Nodwick had the main cast complaining about lack of standard adventure hooks coming their way, only to later become exactly this sort of thing... for another group — and, again, complain about it.
Yeagar: We're adventurers, too! Don't leave us like this!
Fighter of the other group (to the wizard): If I ever act like them, I hope you'll put a magic missile through my ear.
Nale, more than anyone, is a firm believer in this trope. What matters most to him isn't necessarily the end result, or the methods used, but that he wins and that the opponent knows he was the one to do it. This contrasts him with his brother Elan, a selfless hero who cares deeply about genre conventions.
In the Start of Darkness prequel book, when Right-eye and Redcloak are trying to determine why Redcloak wasn't affected by a magical disease, Xykon interupts with a "Well, that's great, but if we can steer the topic back to where it belongs, namely me..."
This is the one flaw in Tarquin's extreme Genre Savvy. He's brilliant about using tropes and the Theory of Narrative Causality to his advantage... except that he's dead certain that he, personally, has to be the centerpiece of whatever story is taking place around him. So when his long lost son is accidentally reunited with Tarquin while being part of a plot that involves the machinations of multiple gods and their high minions, devils and demons determined to team up to storm the heavens, and the possible unleashing of a world destroying Eldritch Abomination, Tarquin's take on all this is that obviously the story is meant to be all about him and his son having a Luke Skywalker vs Darth Vader style showdown, and makes himself an antagonist to the group trying to stop the possible end of the world solely on that basis, and attempts to severely compromise their ability to save the world, all because he can't accept the story not being about him. Julio Scoundrel even tells him point-blank that Tarquin always thinking that everything is about him is one of his greatest flaws. To highlight this, Julio doesn't think much of Tarquin and sees him as just another one of his B-villains. In addition to his conviction that he's the Big Bad, he has trouble understanding others' viewpoints, killing people to show he cares for his heroic son, and then being surprised that said son takes it badly.
Roy's dad Eugene is so single-mindedly focused on clearing up his Blood Oath (only now that not doing so has had consequences for him personally, of course) that his solution to the problem of the gods voting to destroy the world is "let them, because that'll take out Xykon too and I'll finally be free". It's only when Roy points out that this would condemn millions of innocent dwarves to an eternity serving Hel that he sees anything wrong with it, and all he does then is suggest warning the dwarves so they can "run into a dragon" and die honorable deaths first.
Roy's mother and grandfather reveals that Eugene always been this way, even as a young man and a child (possibly showing signs of some sort of disorder). Fundamentally, all Eugene really cares about is his current goal, whatever it happens to be. Hell, he doesnt even care about rejoining his family in the afterlife.
Parakewl from Tower of God. He demands that people sacrifice themselves for him, cares more about his scores than his comrades' deaths and after insulting everybody and fucking everything up, he demands to be saved because his dream is superior to those of the others.
From Slice of Life, Pumpkin just can't be happy for her brother Pound to start flight camp, and takes up the next few strips searching for someone to teach her magic before Nightmare Night. And on Nightmare Night, she deliberately sneaks away from Pinkie (who her parents had told her to stay with at all times) into a haunted house that she was too young for, daring Pound to go with her, though it's heavily implied that her desire to learn magic early is a product of Green-Eyed Monster due to Pound going to flight camp.
Dom of Plume is so self-absorbed, when a pair of bounty hunters tailing him and Corrick turn out to be after the other guy, he considers shooting them because they aren't after him.
Stand Still, Stay Silent: Emil views being part of the first expedition in the Silent World in ninety years as an opportunity to prove his great talent and get himself a promotion. His background includes going from private tutors to public schooling after a Riches to Rags episode, and doing badly in it. His interpretation of the incident is that the school system was having it in for him, rather than any problem with the tutors. When a conversation happens around him in a language he doesn't understand, he frequently assumes the people involved are Hiding Behind the Language Barrier to talk about him, rather than the reality of one of them only being able to speak the language in question.