dude, Frost is a good character, and not to mention that she's the easiest character to perform badass combos with or without a weapon. not to mention that she could be in the next game, seeing how she was suppose to be in the 2d series as what we heard when watching her little bio kard thing with the other characters.
im not totally sure if she may make a comeback in THIS game, maybe in the others if midway continues, but to be perfectly honest, i think she has a 75% chance to be in the game.
and don't say you may gain some enemies, just hope you don't ask if Hsu Hao is gonna return... then you may have some enemies