So I had an idea. What if Kronika ends up playing the exact same as Geras except she has all of his special moves? Depending on how the computer plays, this could make things very difficult.

Geras can increase the timer on the clock or decrease the timer on the clock. Anytime Kronika is ahead, she decreases clock time. If she is behind and time is low, time increase. Maybe give her a healing move as well, and all variation Geras would be a major force to be reckoned with.

Perhaps as a lead up to this, you would have to fight each character with all of the benefits of all of their variations before finally fighting Kronika, who is really just Geras with every potential moves.

This could work well and I would be happy with it