Michael Afton is the teenage son of William Afton. He is a main protagonist in the FNAF series and is shown to be a angsty/rebellious teen. Michael, in his teen years, is a troublemaker and loves to antagonize his little siblings, especially his little brother Evan. However, he does have some moments where he can be sensitive and caring. 
As a grown man he now is less of a trouble maker is is trying to fix what's wrong, he is nice and caring, yet tries to act tough at times.