It All Starts with a

Shinsou grew up learning not to use his voice. When his quirk first manifested, his parents tried using it to their benefit, forcing people to give them money and valuables. When authorities found out what his parents were making him do, Shinsou went into the foster care system. From there he met all types of nasty individuals, many of whom forced him to wear a muzzle at all times. When he gets into UA, Shinsou cannot believe it, and he is certainly surprised when he is put into class 1-A after the sports festival. Or, a traumatized Shinsou is very confused when people want to talk to him a lot. Also this strange blonde kid keeps bothering him.