Cyrax: Programs a self-destruct sequence into his arm then explodes.
Cyber Sub-Zero: Take a bomb out of his chest, arms it, throws it back in, and explodes. Everything around him turns to ice.
Kenshi: Throws his Katana up into the air and it comes down and goes straight down into his head with only the handle sticking out.
Kano: Rips out his own heart, stands there and looks at it while staggering, then falls down.
Kung Lao: Throws his hat like a boomerang and it comes back and takes off his head.
Rain: Covers himself in water then summons lightning on himself.