I hated Wizpig too, I HATED him! But that's a sign of a good baddie so I don't know.
I actually think Lara Croft is the dumbest video game character, literally. She was actually DESIGNED as a sex symbol, can't get much dumber than that. The games suck too.
I'd also have to count all of the characters in the Sonic games except Sonic. Especially that Rouge The Bat......urgh.........
Jar Jar Binks also counts, I've seen him stinking up games too.
Oh, actually, I'd have to say the worst is Farah from The Prince Of Persia. Utterly useless woman. She misses enemies and shoots YOU, she DIES A LOT, she WON'T MOVE out of the way of the giant Ogres axe about to split her cranium, yet she will RUN FROM YOU, she has to be saved numerous times, all she can do is get through small holes and cracks in walls, that's it! She complains and moans, and she thinks she is the best thing since sliced bread. Not only that, but you'd think her polygons would be arranged so she made up for her insescent whinging with some eye candy, but NO! She is Mrs. Pyramid Booty. Completely loathesome creature.