Plagarism:
I enjoy recreating my favorite characters in-game, but it really irks me to see people that play as them. There are a number of players who seem to exclusively play as non-original characters. I brought it up to one person who acted like a real jerk about it, and cycled through all of his slots, each of which was a different non-original character. He went on to argue that he has plenty of other, original, characters. I've been playing for months and I've never seen him playing as an original character.
Unoriginality:
This is a sister-peeve of my first one. You've got a green brute that was borne of gamma radiation? Wow, really original, man. Oh look, a hardened, no-nonsense guy with claws and regeneration. Very nice. How's "Captain Patriot" working out for you? Liking your star shield? Ugh. This game gives you so much opportunity to create! Why aren't you challenging yourselves?!
Michael Jackson dance:
Weird, I know, but it genuinely annoys me to see characters using this dance emote. It's an unnatural looking dance, and it especially doesn't mesh with any character themes. Even worse is when a large group of people are doing it in unison. I'm fine with almost every other dance, but this one looks robotic and ugly, yet it's the most popular. I'm so sick of seeing it.
Summoning around Ms. Liberty:
When you're hanging out around Ms. Liberty, there is no reason for you to be summoning your stupid, ugly, demons or robots. I'm trying to focus on a costume change, or slotting, or a new power, and their snorting, roaring, etc. is so obnoxious! Have some courtesy!
Non-super heroes:
I know there are super heroes that don't wear tights, and I'm fine with that. The thing is though, seeing traditional super heroes is rare in this game. You just see tons of street clothes, demons, angels, furries, etc. It's so refreshing to see characters with more traditional super hero concepts.
Bandwagons:
Water set just came out. Now every third person is a water character. This isn't a rational complaint since it's a new set, I'm sure they're eager to try it out. I just wish they would put a tiny amount of thought and effort into their water characters.
Large characters:
It's extremely rare to see a huge character that's well made. They're always freakishly proportioned (And not in a stylish way.) and generally ugly. You're better off not making them, or using restraint on that physique slider. I'd rather see a tank that looks more like a normal guy with the physique slider all the way up than a huge character with the physique even half way. It just looks bad. We can't have Hulk and Juggernaut looking characters in the game. The character models just don't allow for it. They're going to have teeny-tiny heads and hands no matter what. It just looks weird.