Simon "Ghost" Riley is- well.. no one really knows what he is. He's a monster, that's what many call him.

He's a hybrid, sure, grown and experimented on in a lab until he broke out. He joined the military, using his power and strength to a good cause.

But sometimes, he gets out of control. When he gets upset, he morphs into a kind of monster. He's a giant towering over ordinary humans and crushing anything he comes in contact with. (Think hulk but less green and bigger).

He usually has to spend hours alone to calm down after he transforms, ho one can calm him. Until you came along.