Well, my favourite would be, of course...
Dr. "Eggman" Robotnik.
Childhood gaming is, probably, part of why I choose him, but... aside of that, I think I can point
the charisma, smartness, but also the fact he is so serious but so humouristic at the same time.
Oh, I think Shadow and Silver would be on my "hate list" as villains... and as anything else, in fact.
And if you watched the Simpsons, there was a villain named "Scorpio". Quite the funny sir, too.
(
"beware of his generous pensions, plus three weeks of vacation each year..." )