He's a dick lol I guess you can categorize him as an anti hero, but Kaiba is such a dick.
Cell is made up of the cells of others. His design is genius and his story, while a little complex, is very enthralling. He is extremely smart, but has no greater purpose in life than to reach perfection because that's what he is created to do.
Beerus I like primarily for his power. He can probably solo all of anime combined, with the exception of his own. He is really indifferent, but is used as a comedic relief because he does just about anything for food and throws temper tantrums.
Also a dick. However I love that despite being an undercover police officer, he follows no justice but his own, which is to slay evil immediately. It wouldn't matter who it is, if they are evil, Saito would kill them without hesitation.