This might be harder than I thought. Or not. Let's see...
Someone mentioned Kamina from Gurren Lagaan, and I'm gonna have to agree, though "hate" might be too strong. I just don't like him that much. I've only seen the first three episodes of the show, but in each one, he boasts about how awesome and outstanding he is and then promptly fails while Simon does the dirty work. He can't seem to back up his confidence. :/
Quagmire from Family Guy. Used to be kinda funny, I guess, but the newer serious side of him just makes me sick to watch. I don't know if it's the voice or the whole "OOPS! We forgot to give Quagmire his own reality beyond sex and piloting for seven seasons! To the drawing board" attitude they're taking to build him up now, but whenever he's on-screen now, it just makes me uncomfortable.
Hank Hill, but it might just be because it got to a point where Hank was portrayed as the paragon of what's right on King of the Hill. I feel like there are too many episodes where he has to fix things in the end.
Since Wolverine seems like he cannot die, and due to overexposure, he becomes less and less interesting to me. Kind of would rather see some other mutants take the spotlight occasionally. Like Xavier. Or Mystique. Or even Rogue. Or Nightcrawler (but I don't know much about what he's like in comics; I usually think of the one from X-Men Evolution :/ )
Apollo Justice from Apollo Justice: Ace Attorney. Problem 1 is that he has next to none of the charisma Phoenix Wright had. Problem 2 is that we hardly know anything about the guy even though we WERE HIM FOR ABOUT 15 HOURS OF THE STORY. Most of the cases revolve around Phoenix Wright to such a degree that this game might as well have been called "Phoenix Wright: Above the Law" or something. Problem 3 is that he barely does anything to move the cases along. Most of his actions are guided by Phoenix and Trucy. I wanna play this game as Trucy, goddammit!
Sonic the Hedgehog. Again, not necessarily "hate", just "not like as much". He's the "too cool for school" guy, the one that might've been cool back in his hayday but would probably be bagging groceries while shouting 90s surfer talk now. That guy's annoying. Personally, I prefer Tails, he's almost as fast as Sonic anyway, and he can fly. And fix and drive planes. Nice.
And now, for probably the one that's going to get me lynched, and let me preface this by saying that I don't necessarily hate this character, but I don't really like him as much as other fans of this show seem to...
Bolin from Legend of Korra. Yeah, he's funny, but there really isn't much to him beyond that. Bolin is funny, he crushed on Korra for a little while, he's an Earthbender... that's about it. He's not that smart, he's not a very noteworthy Earthbender, and he's currently got the depth of a 7oz plastic cup. Asami at least has the fascination with cars, the daddy issues, involvement in a love triangle... Maybe the next season can figure out what to do with him because I probably could like him if there was something more there (if the next season itself figures out what it wants to do after that disaster of an ending).
That's about all I've got for now. Maybe there are more that I'm missing...