Mimi's father

Mimi's father was briefly seen in the first episode of the anime. He was present in Ganta's trial for the Nagano school massacre and when Ganta resisted arrest, he and some other people from the audience attacked him. He punched Ganta and witnessed the fake video footage where Ganta confessed to everything and even mentioned Mimi, his own daughter. Mimi's father shouted at Ganta that he saw Yamakatsu and Ganta as his own sons and asked him why he did it. He was taken away by the guards after that.