Tomoo

Tomoo is a minor, but significant antagonist in the anime and manga series Elfen Lied. Tomoo served as the chief force that ultimately turned Lucy into a homicidal maniac, and he's also the reason for her deep hatred of humanity.

LOTM: Sword of Kings
He appears in the season 1 of Sword of Kings Saga AA as a tertiary antagonists, however, with 17 years old. He is in the second in command of Mafusa Gang and is the main partner of Aki Honda.