Ra'am

Ra'am is a fighter and gladiator par excellence, with the ability to transform into anyone or anything he's ever defeated. Ra'am is the darklord of a domain of endless struggle, whereupon everybody must eventually fight everybody else in the arena no matter what their relationship is. Anyone who dies rises the next day, thus eliminating even death as an escape. Ra'am waits at the top of the tournament, and anybody who beats him assumes his place as lord of the domain.