Issei the mafia dragon (highschool dxd x hitman reborn)

Issei left behind by his "family" and harem over his younger brother who had the dark dragon overdrive the current strongest sacred gear (description on this later im too lazy it just give the user the power of the booster gear and divine dividing) he was abandoned by his blood family for not being smart like his brother or as strong. He finds out the more hard way that he has potential to be the strongest being in the world, he is brought to the vongola family because of his blood that he inherited from his dead father who made a child with his mother but died and the mother married another man.

He is the undecimo the 11th boss of the vongola family

(Inspired by naisu9 he came up with the idea in only making this cause I didn't like some of the things he did with the fanfic)