Koro-Sensei's Human Form & Backstory! - My Otaku World
https://myotakuworld.com/koro-senseis-human-form-backstory/
WEBIn fact, Koro-sensei started as a handsome human heartless assassin. As a human, Koro-sensei was quite an attractive man. With fair skin dark eyes and short raven hair, Koro-sensei was quite the looker! He also made sure to always have a nice, kind, and friendly smile on his face. This smile was just a farce to hide the deadly assassin that he was.
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