Shinji Ikari.....sweet shit what a fucking douche. Surrounded by hot women, driving a bad-ass mech, quit yer whining ya little bitch! Gotta throw Beavis and Butthead in there. A whole generation of dumb-fucks spawned from that piece of shit. I ever meet Mick Judge, I'm gonna hit that fucker in the head with a shovel and feed his corpse to a retarded Giraffe just so he splatters when it shits him out.
Ash Ketchum. He's really 22 and he has never beaten the champion of any region, and he hated Gary, who has long been a champion. Yeah, he's the champion of the Orange League but that doesn't count. :/ No one sucks at Pokemon more than him.
For anime, it's a tie between Sasuke and Sakura from Naruto. Sasuke is a whiny little bitch who, once he 'beats' his brother (I use the term loosely because, let's face it, Itachi was going to own him had it not been for his illness) has no real purpose left in life and becomes an even bigger emo kid than he was before. Sakura... she's fucking annoying and unimportant in any way, and yet for some reason she get's more attention than several other, more important and awesome characters.
For cartoon, it would have to be the entire cast of Rocket Power. I don't need to give a reason. If you've seen it, you'll know what I mean. And if you haven't, don't.