Well, it was a popular cliché at the time, as many villains were romanticized edgy boys, and authors often made them antiheroes rather than chthonic evil. For example, in Sailor Moon, the villain's henchmen are Mamoru's fallen brothers, who were the male counterparts of the Sailor Girls. Takeuchi even liked to ship them in her arts, lmao.
I really appreciate the translation of this manga. I loved the anime so much and was so sad that there was no manga TL, so you're really saving my behind here.