Sky King

 Sky King (空の王) is a Mysterious Being who rules the skies and wants to take Earth for himself.

Appearances
Sky King is a humanoid bird like being with the appearance of an aging, but very muscular old man. He has long hair, a large nose, wrinkled forehead, sharp teeth and pointed ears. He has two sets of wings on his back as well as talons on his feet and clawed fingers. He also appears to wear a small crown. His overall appearance is reminiscent to the traditional Japanese Tengu.

Personality
Not much is known about him, but he is arrogant, believing he could destroy the Heroes Association with ease.

S-Class Hero Arc
After seeing the sea king and underground king perish, he decides he wants to take over the world himself with his three underlings: Kite, Eagle, and Falcon. However, all three of them are killed by an unseen enemy. It is implied that he perishes as well.

Abilities
Befitting his name, the Sky King has large wings that grant him the ability to fly. He can also shoot large, destructive beams out of his mouth. It can be said that he is rather strong considering he was able to seriously jar the Heroes Association headquarters. Along with his own powers, he has a group of underlings that obey his every command and all bear the name of birds.

Trivia

 * It is worth noting that he is the third of three "Kings" mentioned in the series, the other two being the Underground King and the Sea King.