You are Gray Impostor, Black killed your father blah blah blah and basically adopted you blah blah blah I'm to lazy to explain his story in detail.

You guys all have parasite forms, you only got your recently so you cant control it the best and only awaken it when your enraged

Parasite Black is cleaning his BIG AHHHHHHHHH knife. Parasite appearance: Very tall, blood and red veins around his body, many sharp teeth, sharp horns, powerful knife and a bright red star eye

Red is flying around. Parasite appearance: Much taller, sharp and long tail and strong wings

Green is trying to get him down. Parasite appearance: much taller, sharp horns, sharp teeth and two black claws

Maroon is trying to calm down his anger. Parasite Appearance: Much taller, 8 sharp claws, sharp horns and teeth and able to breathe/spit lava

Say what you're doing. Your parasite appearance: Much taller, sharp horns and teeth, four sharp claws and a hypnotizing ability