King Vapus is the supreme ruler of Planet Vaporia, and emperor of all Vaporians. He is the boss of Vaporia.
In Legend of the Eight Firstborn, when the main group came to Vaporia to save Team Brotherhood, the Toxic Four, and Aurra & Bane, they had to battle King Vapus. They defeated him when Rachel McKenzie impaled him in the glowing stone in his chest with her Master Sword. This caused all of the Fear Energy on Vaporia to leave, and Vapus and his Vaporians were restored to normal. They thanked the Kids Next Door as Kirby gave Vapus some chocolate.
When They Come For Me - Linkin Park With Lyrics
When Vapus Comes