Oooh yes. I have decided of how Bartz' mimicry works:

He can just magically learn one move when he leveled up and limit it like Pokemon. Only six moves or if he wanted to make new mimicry move he need to forget a move. 'Cause that was what in the game he came from.

Example: "Cyclone Whip" Crash Bandicoot's Cyclone Spin + Shantae's Hair Whip. The damage is up to Bartz' stats.

and about Sans- I decided to make him like a 1k HP character instead of just 1 HP.