Satoshi Mashiba (真柴 智, Mashiba Satoshi) is a character introduced in Koe no Katachi.
Mashiba is boy who becomes interested in and joins Ishida Shouya's group of friends upon learning they are making a movie. He is eager to be the lead actor and is considered handsome and talented enough to do so. Mashiba was lonely as a child and the other children took him for granted and bullied him. Now, he is completely intolerant of bullies in any form, and while generally calm and level-headed, he reacts violently to any random act of bullying he sees.