From a branch of the Gero family. Grandmother's favorite. He's a type of poison master who stores toxins in his body and uses poison threads as his weapon of choice. He stores his beloved Master Hikaru's toxic concoctions in his own body to feel closer to his cousin. He never cared for Akari Gero, Hikaru's younger sister. His favorite food is hamburg steak.
(Source: the manga's character introduction)
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