No.
Broli, or any other DBZer, doesn't cast Spells. He blasts stuff. And not with lightning, fire, sonic, or acid, but Ki bombs and beams.
GitP's host, Richard, has a nice Class that works out ok. It still has spells but mildly and it has a built in supermode that obtains +24 to Str, flight, DR/SR, and so on.
LinkEdit - Interestingly, the Avatar has a number of multi-class related Feats. Dip Champion once and any Sorcerer or Wizard can once per day transform for +23 to their casting Stat. Monk stacks too (woot!).