I thought a cool mode would be if someone is Cell, and the two androids (bots) are somewhere in the map. They should have a lot of HP, and Cell should be considerably more powerfull than the Z-Fighters: Goku, Gohan, Vegeta, Trunks, Krillin, and Piccolo.
The Z-Fighter team has to stop Cell from getting the androids, in other words, kill Cell. Cell should have a VERY HIGH powerlevel. After all, he is against 6 other players. Make him very tough. If he reduces an android's HP to below 10, he can use his tail to absorb the android. This will cause him to transform. Obviously, his transformations will make his powerlevel even higher, making him even more difficult to kill. Preventing his absorbtion of the androids is the teams top priority. You would have to kill Cell in a certain amount of time, while Cell is trying to become perfect in the same amount of time. If Cell becomes perfect, he gets a point. If he becomes Perfect Cell within the alloted time, then the timer is gone and Cell just tries to kill everyone. If Cell kills everyone, he gets another point. If the Z-Squad kills Cell, they get a point.
The Z-Team has 1 opportunity to get a point for the round: Kill Cell. Cell is capable of earning 2 points each round:by becoming perfect within the time limit, and if he kills the z-squad. If the Z-squad is dead within the time limit, he can still try to absorb the androids before the time runs out to get another point (think of it like the terrorists are dead but the bomb is planted, and the counter terrorists can still try to defuse the bomb).
The rounds go on until a set amount of points for the server is reached, or the time limit for the map runs out. There are no respawns each round.