Koro-sensei

(koro-sensei),assassination classroom, yellow octopus teacher; round, yellow head and body; wide,small black dot-like eyes; smooth, bright yellow skin; numerous long, tentacle arms protruding outwards and many tentacle legs at the bottom; dressed in an academic-style black robe, black suit, white shirt, black tie, and red vest; orange-gold trim on the collar and a black-and-gold tie accessory; small black mortarboard cap with an orange tassel;