I’m gonna guess you read MXTX’s novel?
Spoilerrrr
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He is Tez
Wait what
If you guys are talking about the final boss Reed, he is the ML.
From the spoilers I read:
Reid/Reed(long black hair and red eyes) is the corrupted form of Tesilid. Tesilid fully corrupted at his 100th regression. His goal is the destruction of the world.
Tesilid is the ML. Tesilid and Ailette had children, the oldest of their children is a daughter.
i’m sorry but the demon is lowk hotter than Tes… or maybe i’m just a sucker for evil men with long black hair idk