Maybe that's why the ex-thirteen crown music guy said that Sully could never be the demon king, because he also exists out of the norms of the demon world.
And maybe that's why he is "cursed" as the other guy said, because he probably can't interfere in a important way, even when people that he loves need him. Maybe that's why he needs opera to act as his hands.
Or he is "cursed" because he is supposed to act one way or to have one responsibility that it's his reason to live (like mephisto raise kings as if it was his reason to remain alive) and becoming the demon king is not within that reason of his.
I don't get the dark knights inferiority complex towards black scythe. There's no need to feel like that, it's not a competition (yet). Relax bro (〜 ̄△ ̄)〜
Honestly, I’d feel the same. Imagine doing your best and still falling behind that much (just because the other regressed a hundred times), it’d make anyone wonder if something’s wrong with them. The good old “Since Yu was born, why was Liang born too?” After all, he would be the best if the MC hadn’t regressed. (And the world would’ve ended lolol.)








Oh, my boy is turning into a demon. Did you guys see that teeth sticking out? It wasn't there before. I'm pretty sure he's going to turn into a demon slowly AND Ali-san is definitely delkira or his mana and it's pretty obvious, because when iruma got to evaluate his specialities, he used Ali-san's magic and what came out was delkira's crest and all those other signs that I'm too lazy to mention.