An unique ability.

[lcr8]

I have a strange request, things seem to be a little complicated. If you defeat the opponent, they will fight on your side in the next game with 30% of their original health and will be slightly greenish in color. You can get up to 4 or 5 supporting fighters. If you are playing in a long mode such as arcade or survival, the first helper will be eliminated and the last opponent you defeated will join the group
(i'm trying zombie-ish mode)

[Foobs]

This is downright impossible to implement.