Jerry from Tom and Jerry is, in my opinion, the absolutely biggest asshole from any cartoon. He is usually the instigator in practically most of the situations and just constantly harasses Tom. Anytime that I watched that show, I always felt bad for Tom.
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This guy. (The only picture of him I swear) It's on a show called curious George, I have to watch it with my sister and this fella' is a real asshat on it.