Well I'm not much of an anime/manga fan (which is probably my first problem), I like western stuff more, so most of my favorite stuff never gets cosplayed anyway... But I do have to say that my favorite video game series, Assassin's Creed, NEVER gets the love it deserves. If people do cosplay from it then they're generally doing Ezio, which is fine since Ezio's my favorite character, but since most people buy their Ezio costume it never fits correctly :C It's always too loose! And everyone who has played the game knows that Ezio is this sassy, womanizing Italian dude from the Renaissance, he would never wear something that didn't fit him... Plus Ezio is awesome, but there are SO many other awesome characters who need love too.
tl;dr ASSASSIN'S CREED 1/2