This story is ultimately Star vs Marco since I love the theory of them being enemies. Marco has had enough of Stars unintentionally bad treatment of him. He wanna break the blood moon curse and be free, he meets the gods Luna and Solis. They help him by turning him into an undead knight, whatever that means. At the same time, they pull him into their conflict.

Our green boy predictably got his dream crushed, but what is one more disbeliever. He isn't a super genius or anything like that, but he will not let that stop him. He will become a hero and a decent one at that. It doesn't matter if he is dirty or cowardly, he has to survive in a world with quirks while being quirkless.