Well, I personally guess that the most degenerate of all the anime is Bachi-gu of Green Green, is incredible the quantity of pervert things that can have in mind this subject, especially when of Chigusa treats.

PS:Sorry if my english is bad

I'd say Haruka from FLCL and Ichigo's father from Bleach

(colorful characters are also very perverted, but they are always different so I didn't include them )

ps : I forgot Kaolla from Love Hina...

there was a thread about the dumbest character, wel I will answer the same I answered for the other thread :
Puni puni poemi!! if you guys don't know her you don't know is a reall degenerated characters!!

i think haposai from ranma 1/2! and that oldy from dragon ball, too! dont remember his name...^^

yes kaola from love hina

Well i'd have to say Kintaro Oe from Golden Boy, not because he's stupid by any means, just horribly horribly perverted.