So, here goes--
Rurouni Kenshin--Uonoma Usui, Honjou Kamatari
Fullmetal Alchemist--The Homunculi
and Shaman King--Hao
Also, I'd like to advertise my website, which is an information site on the Rurouni Kenshin villains. It's the Ruroni Kenshin Asylum.
I'd appreciate if you could go there, and give some feedback. ^^