I'm looking for Manga like Solo leveling, meaning it has to be good in terms of characters and have cool character designs. A lot of recommendations are usually generic or have bland designs.This for example is what I mean by Solo leveling having great original designs. It's not necessary but Ideally I like the kind of power fantasy story about a demon king with dark magic such as Overlord, Hellsing, Solo Leveling, even Slime Tensei.