She is the daughter of the ancient Knuckles tribe's leader, Pachacamac, who was in Sonic Adventure. She is a caring person, and everyone loves her, however, she sometimes opposes her father's ways. She moves very quickly and is a proud warrior of this tribe.

She is a happy and energetic girl who loves Sonic. Even though he doesn't love her, she is always after him. She will chase after him no matter where he goes. She won't give up easily, so her opponents will have a hard time fighting her!

This time, Chao join the battle using their own machine that Tails built for them. Their attacks and defenses aren't very strong, but they can move quicker than anyone else. However, there is a rumor that they don't know how to drive their Chao Walkers very well.