I'd probably run with thunderbolt. I know a lot about electricity so I just feel I'd have the highest potential with that. As for who I'd be grouping up with, probably Castlevania's Alucard. Centuries of knowledge, a fairly powerful list of spells, and in all honesty, I think the only thing he values is his sword maybe? He isn't fond of his vampirism, that much is for sure but it is the source of a lot of his strength and abilities.