King Mickey, simply referred to as The King, His Highness or Your Highness or more commonly as "Your Majesty" is the king of Disney Castle, a recurring character, and the main Disney Protagonist in the Kingdom Hearts series. He travels the worlds battling the forces of darkness and is the chosen Keyblade wielder for the Realm of Darkness, though he follows the path of light. Originally believing that the darkness had to be eliminated, he eventually realized that light and darkness are interdependent and cannot exist without the other due to his encounters with Riku.

Though he is known as the King of Disney Castle, his true name is Mickey Mouse.

While only being 2'3" (69 cm) tall, King Mickey is an incredibly powerful character in the Kingdom Hearts universe, as shown when he defeated three Darkside Heartless in a single blow whilst inside Kingdom Hearts. He has appeared in all currently released Kingdom Hearts games and will be in all announced games. First studying under Yen Sid, Mickey is possibly the inventor of Gummi Ships, the first to realize the threat of darkness spreading between worlds, and one of the characters most strongly affiliated with light, including Sora. His strength is not always readily apparent, as his character remains very simple spoken, colloquial, and lighthearted. But contrary to this appearance, King Mickey has played a major role in all Kingdom Hearts games. So far Mickey has been in all of the Kingdom Hearts games, excluding Kingdom Hearts V CAST.His key phrase is"Helping others comes before asking others for help."
—King Mickey