Sonic World Adventure (manga)

Chip Because of Sonic who fell on the planet, he completely lost his memory. To regain his memory, he goes on a world adventure with Sonic. "The happiest moment is when eating delicious things!", he's a glutton. He always has chocolate hidden somewhere. He's optimistic and cheerful, he's usually happy and at ease, but sometimes, he helps Sonic with a strange power. Maybe a big secret is hidden in Chip's lost memories.

Eggman Evil brillant scientist who has a superhuman brain boasting a IQ of 300, as well as the mind of a selfish and greedy child. In order to accomplish his ambition of building a giant amusement park "Eggman Land" to extol himself, he succeeds in putting Sonic in a trap, and taking the Chaos Emeralds. He absorbed their power, and broke the planet into 7! A mysterious giant monster wakes up from the bottom of the scattered continents. Dr. Eggman laughs loudly. The fate of this planet...!?