Looking at Charlottes ability's, there pretty awesome! I'm guessing when she is held by many players, it might pay to run her beside the Prisoner so she doesn't lose her passive immunity to sliver effects particularly if the opposition has a Prisoner in their team. Not to mention giving the whole team the same ability for there first 2 turns...

Power move being able to revive an ally with full health! And give the whole team invincibility for one turn!
Even the normal move increasing the health of a random Ally is pretty cool too with a critical strike chance!

I can't wait to see if she's worthy in the arena... sounds like a whole team restructuring if she gets used...