Aku Aku (Earth-6515)

"It is I, Aku Aku. My duty is to protect you. You may summon me by breaking open these Crates. Call me thrice, and I shall grant you special powers."

- Aku Aku

Aku Aku is an ancient spirit from N. Sanity Island who resides within a tiki mask and acts as Sonic Hedgehog's guide, helping him and his friends to protect the world and defeat the forces of evil. He is the older brother of Uka Uka.