One Piece: Marine Luffy, Garp regrets it

MC get Isekai'd as Luffy. At the age of 5, he was assigned to become a member of the Marine. But as Luffy grew up, Garp slowly began to regret his decision. Luffy: "What? Justice? Killing the damn Celestial Dragons is justice!" Luffy: "What? It's wrong for a marine to be king? " Luffy: "What? My three wives and four concubines affect the reputation of the Marine? What law prohibits marrying multiple wives?" Garp: "My dear grandson, stop making trouble. If you continue like this, our Monkey family will become Celestial Dragons!"