666 Satan, Black Clover Recommendations
Black Clover and 666 Satan have something in common. That is that Slum Rats such as Aster the main character of Black clover are hated. Same goes for 666. The O-parts are hated but out of all of them 2 people are hated the most from Black Clover it's Aster for not being able to use magic and in 666 Satan it's Jio Freed a boy who possesses The Demon Satan within him. Aster has something strange inside of him too but he is only hated for his non-magical prowess. Jio from 666 wants to conquer the entire world in a sense Aster does too
Both have main characters that desire to become heroes but in different ways and Both are able to become the demon who people fear
Both are battle shounen manga with excellent art, filled with action scenes.
Asta and Jio both play host to powerful demons and face much adversity from those around them due to the actions of these demons.