Ken Ishiyama ( 'Ishiyama Ken'?), also known as the hero Cementoss (セメントス Sementosu?), is a Pro Hero and member of the U.A. High School faculty where he teaches Modern Literature.
Cement (セメント Semento): Cementoss' Quirk allows him to manipulate any cement based material that he touches, allowing him to shape it into various forms. His Quirk doesn't appear to have a time limit, and Recovery Girl mentioned his Quirk is amongst the most difficult of the U.A. teachers to fight against.