Michael Afton is the (former) Tertiary antagonist turned Deuteragonist of the Five Nights at Freddy's series. He is William Afton's oldest or middle Child.
Before being scooped, Michael was a Caucasian male with brown hair and blue eyes.
After his organs were ripped out by Ennard (A creature of mangled robotics), his body started to rot until his skin became purple, he lost his hair, and his eyes became black with white pupils.
Michael appears in this game as the main protagonist. He works as a technician and was presumably hired by his father to free his sister's soul from Baby. After night 5, if the player chose to follow Baby's indications, Michael gets his insides ripped out by Ennard, who needed to use Michael's body as a costume to escape into the real world.
If the player decided to do not follow Baby's indications, Michael will have to survive for the rest of the night from Ennard. He will then go home but Ennard will chase him down and eventually find him.
In the custom night's minigames, it can be seen that Michael's body started getting rotten until Ennard abandoned it. Baby's voice then kept repeating "You won't die" and after that Michael's body reanimated, almost like a zombie.