Scapegoat

You always want to kill the scapegoat, but doing so makes you one.

Fighters: Works with any number whether it's 2 or 200.
Regen: Immediate after a count of "1, 2, 3, alive", (It's recommended to give people space as they respawn or they might wait till you move away.)
Teams: Everyone vs the scapegoat(s)
Rules: 10% of the players are the "scapegoats". When you kill a scapegoat you gain a point and become a scapegoat, the person you killed is no longer a scapegoat. If a scapegoat kills someone no points are exchanged but the victim becomes a scapegoat and the killer is no longer one. The game is over when one person accumulates 10 points.
Choosing the initial scapegoats: The players who start as scapegoat have a slight disadvantage due to needing an extra kill/death before they can score a point. For this reason your most advanced fighters should start as the scapegoats. Alternately the initial scapegoats can be your weakest fighters but have them start with 1 point.