Gah, so so many evil people that I think are cool.
Not sure what my absolute favorite would be, but heres a list of ones I like.
Naruto - Orochimaru. When I first watched the anime (Watched it before reading the manga), I saw his first appearance in the Chuunin exam giving Anko back a Kunai and though "What a weird looking character. I bet he plays an interesting role later on". To my surprise, I was right.
Fist of the North Star - Kaioh. A man so evil, he killed his own sister just to cause her fiancee emotional pain (A frame a man for murder). He pretty much hated everyone. He was so strong, he had to wear specially made armor that absorbed his excess energy, or it would destroy things around him (including people). Was Raoh's brother (Aswell as Toki's, and had a sister named Sayaka. Raoh and Kaioh look alot alike, as they take after their father, while Toki and Sayaka take after the mother). Was the last person Kenshiro fought in the anime (Although, I think the fight with Raoh was better), and is also where I take my name sake from.
Berserk - Griffith. Trying to explain how evil he is does no justice to him. Read the manga, and experience it.
Angel Sanctuary - Sevothtarte. A highly powerful high ranking angel as a bad guy? Yes, it works wonderfully. He will kill and massacre anyone he finds to not be pure, using extreme prejudice. Unfortunately, the OVA anime never got far enough for anyone to really see him.
Death Note - Yagami Light. COME ON, THE MAIN CHARACTER'S THE BAD GUY! Genius idea, and it worked wonderfully. Light proves that its good to be bad.
Hunter X Hunter - Hisoka. I agree with whats been said about him. He's crazy and insane, but he's still cool.
Bleach - Aizen Sosuke. I truly did not see his evil side coming. Espeically after they found him dead. I figured Gin would be the bad one. Aizen is a mastermind type of bad guy (Like Light), and prefers to plan things out and think things through before fighting. He's done this to the point where we have hardly ever seen him fight, and still do not know his fully abilities. The mystery of his full abilities adds enough interest from me to add him to the list.
One Piece - Buggy The Clown. I hate clowns, seriously. But Buggy was awesome, even though he was mostly a source of amusement more than your stand evil bad guy. Plus, hes a pirate clown. A PIRATE CLOWN. Show me any other manga with a Pirate Clown. Oh, wait. You can't.
![biggrin](emoticons/beigebiggrin.gif)
I could probably mention others, but I just pulled these off the top of my head, and its taken a bit to type this up properly, so I will end it there.
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