Kraken

The Kraken, now the last of his kind, was king of a beautiful underground world that was destroyed when Robotnik began drilling the area for oil. The drilling blocked the flow of a green water that apparently kept the underground wold alive as well as nourished the Great Forest, although it was unknown to those on the surface. As the plants in Knothole begin to whither, Sonic, Sally, Antoine, and Rotor go to investigate the cause and discover the kraken and his now-destroyed underground world. He at first believes all “surface-dwellers” are responsible, but comes to understand only Robotnik is responsible.

The Kraken is a large, pinkish-brown bipedal creature that lives underground. He has dark brown/black tusks, short legs, and fingers that resemble tentacles. He is large enough to easily pick up Sonic with one hand. He belongs to his old throne. He's incredibly strong and knows the underground well. His anger can sometimes make him lash out at anyone. At first, hostile to everyone from the surface, but later is grateful to them for helping him.