I say let her steal active powers only, but as many as she wants. Then she can build up a huge range of possibilities, but can only use 1 each round.
As for Shojo, I do think he should be able to negatively affect non-lawful characters, but it should be in an indirect way. Perhaps an Arrest Warrant? Shojo can issue an arrest warrant. That character, hampered by the Sapphire Guard, acts on 0 for the next 2 rounds.
Whoops, thats character stuff. Ok, some general:
Balance is very important. No problem with differing inits and HPs, but they should all be balanced out. So powerful abilities go with low HP & init. Thats obviously happening already, as with MITD (high DR, low HP; big attack, restricted).
Action stealing is a very powerful ability. Overpowered? not sure yet - give me a char with Charm and watch me abuse it :D Then decide.
There are very few defensive abilities that would reduce or avoid attacks. (ie Defensive Stance: reduces all attacks against you by 1)