Since there are two different characters, they should be different
Reinhardt should be a hardened warrior with whip and item attacks.
Why not have some kind of item mix thing (somewhat like in LoI and HoD).
And for Carrie, lets have her have different elemental attacks, that her family is known for.
Short range fire.
Long range spreading Ice
Homing electricity
And maybe throw in a few more elements..
Charlotte in PoR has a nice collection of magic, why not something like that? (Even though they are not related, as far as I know)
The problem is to make the two balanced enough, so the difficulty is not to one characters favor.