One Piece: The Tulip Family

The protagonist lives a very humble life. When he sees Luffy and others, he wants to eat them. Even though he is much stronger and is said to be decisive in killing, all his men will be killed without leaving a single person alive. As a result, the protagonist will not kill anyone he defeats but will admit defeat, and then the opponent will recognize the master. The logic is that the one summoned is 100% loyal. However, when he got the Thunder Fruit, he did not want to summon or feed it to his subordinates, but gave it to Enelu, and then Enelu accepted it as his master, without any regard for human nature.