Majorina's a witch, thus probably a long-range spell based fighter. Those are actually trickier then the power (Akaoni) and speed (Wolfrun) types. Joker, on the other hand, is probably all three, and much stronger then Majorina, Akaoni and Wolfrun put together. The only reason he's not fighting is because he seems to be searching for something that can probably only be found by the girls once they reach a certain level.
I mean look at this guy: