Freddy Cougar is the most evil charcter of all time, I mean think about it he's a child molester/murder. He did crazy stuff to animals as a kid, killed his wife, tried killing his daughter and kick the shit out of that other dude...whats his name...oh Jason. This dude is reeking of pure evil. Joker is another evil ass dude, I can't believe neither one of these guys are on the list.
As for Galactus "The devourer of planets" he is nor good nor evil, he his a force of nature. If you ever read Alex Ross's Earth X, it explans why Galactus goes around destroying planets. He is trying to save our modern day universe for the over populating Cosmic beings Celestials, who had destroyed the universe that he once lived in enos ago. Thats why Galactus does not destroy planets at random, rather he chooses planets that have been implanted with a Celestial seed. Thanos has a pretty cool story line too, in the second part of the story called Universe X.