There are no classes per say, you can interchange any character (male/female) and mix and mash martial arts styles. I ended up with the Monk since it was an extra character added for the special edition. The one thing that sucked about this game is that their clothing didn't change as you don't get armor. You get jewels that increase your stats. You can also add points to various martial arts styles. Like in any RPG, if you want to max out your character I suggest you pick one of the early styles that you like and max it out. Then max out spirit leach and paralyzing palm. For animal transformation, pick jade golem. I think I ended up puting a single point in one of the elemental styles (I think stone) so I could pull off a Fist of the North Star move and cause my enemies to explode in bloody bits. You are also only allowed 1 NPC to accompany you. I tended to pick the girl who can heal you and left her in that capacity. Having her aid you tended to get her knocked out quite frequently.