[@Blizz]: Aside from the fact that he is twelve years old and he seems to have no ability section...

I mention mindless undead being considered an abomination by the biggest religion in Velt, and the party is headed by members of that religion. Given that you mention one of his spells is raising them and he has no sense of right and wrong there's going to be a major problem there that's not just going to be an argument or a few nonlethal blows.

Also sapient undead have to be raised very quickly after death with a mostly-intact body. And even then it has potential to fail.