Chip

Chip real name: Light Gaia is the deuteragonist of Sonic Unleashed and a fictional character of the Sonic the Hedgehog series. Chip is a primordial chipmunk flying creature like entity from the dawn of time, who has been in conflict with Dark Gaia for ages. During the events of Sonic Unleashed, Chip meets Sonic, He lost his memory because the Earth split apart by Doctor Eggman, who awakened Dark Gaia, and had dosed Sonic was Gaia energy making him turn into the Werehog, Sonic meets him by finding him on the ground, and wakes him up to see if he was okay, Chip wasn't supposed to be awaken in this time.

History
Since he revealed he existed in the dawn of time when the planet began and didn't know about it, He existed before Sonic the Hedgehog's heroic days, including Dr Eggman and everyone around. He was sleep for ages and we're never supposed to be awakened, thanks to Dr. Eggman though, He was knocked cold and lost his memory and Dark Gaia was nearly Awakening to destroy the world, shockingly, Dark Gaia and Chip have been in eternal conflict again and again and Chip is always the one responsible to put the work back together. During Unleashed, No one knew where Chip came from, his memory came back when the sixth temple in Adabat was restored with a Chaos Emerald, Chip came across a mural that lured him in and at the universe, the message gave him his memory back and then tells Sonic who he was.

After this, Chip thinks he must go stop Dark Gaia on his own, but without Sonic's help, he might loose to Dark Gaia, so the two work together.