One thing that strikes me about Bluto...
He's rowdy, yes, perverted, yes, maybe even psychotic - but he's a genuinely nice guy. It really comes through in the scene where he's trying to cheer up Flounder after his brother's car got banged up. The little dance he does, the smiley face he puts on, even cracking the beer bottle on his head - you can tell he genuinely wants to help Flounder feel better. I especially like the consternated face he makes after every failed attempt; he's clearly thinking, "Hrm...that one didn't work...what ELSE would make him laugh?"
He's crazy, but there's a lot of humanity in him.
"You may have come on no bicycle, but that does not say that you know everything."