Koro-Sensei

About Koro-Sensei

He is quite intelligent and caring, wanting the best for his students in Class E despite being a threat to the very life on earth. He teaches his students numerous things, including life lessons, while his students are trained to assassinate him before the summer. He doesn't mind this, however, he can move at Mach 20. He is always smiling, he can never not smile but his yellow skin can change colour depending on his mood.