Out of these, definitely Marco, 'cause he made Lyserg the way he was...

I'll go to Yoh's:
1) Because I like him over Zeke... not that he's bad
2) Because I'd like the thrill of Zeke's anger at me, and that way I'll be working harder, so that I could become a stronger Shaman, to protect myself and the world from the long-haired Asakura

Mine would probably be a female Ice Wolf, by the name of Mora, or smth...

Silver is somehow related to Hao... but isn't Asakura. That's what I know.

To tell you the truth, there aren't bad (in that meaning) characters in SK, but I voted for Chocolove, 'cause he annoys Len, and that drives me outta my skin!