Poseidon

 Poseidon is one of the main Gods in Greek Mythology, he is the god of the seas, horses, and water. He is the brother of Zeus and Hades.

Appearance
Poseidon has light blue skin and dark blue-ish hair. He wears a crown with a starfish on it and a pearl necklace with a pink starfish pendant. He has a mustache that moves around on it's own.

Role In Mythology Island
In this case, Zeus is trying to overthrow Poseidon and Hades and take ultimate power. Poseidon will give you his trident, which will aid you in battle with Zeus. To reach him, you must go to the Grove of Temples. In his temple, use the starfish as an offering to enter his realm. Go to his beach. Swim down into the ocean maze. Hercules must move the rock that blocks the entrance.

Role In Super Villain Island
He also appears as a minor character in Super Villain Island, where he rises out of the sea to give you his trident once more so you can defeat Zeus, his brother.

Trivia

 * Poseidon appears much smaller in Super Villain Island than Mythology Island,though being a god,he is probably able to change size at will.