His name is Argrel Gremory, Heir of Gremory House, little brother of Sirzechs Lucifer. He looks exactly like kid version of Hisoka Morrow except blue eyes.
His father Yato was a doctor and a researcher. However, due to having a wife as a hero, he has to take care of the house and children. In short, he is a house husband.
There exist heroes and villains. Heroes 'save' people while villains do 'terrible' things. His mother Bisha is also a hero. Her hero name is Knight Hero Bishamon. Her quirk is called Reequip where she can use various weapons just from imagining it.
But there is more to that. This world has become rather unstable… So you have to save it. It will give a bonus to you and your family for luck so that you can have a happy life. Pss, you can have a harem.���