Chao are creatures that are known to be raised in game
It is known for it's lovableness and for being cute, It can be shiny. You could also make a Sonic chao, a Knuckles chao, a Amy chao, a shadow chao, and a Tails chao.
The chao's first appearance was in Sonic Adventure. The chao's latest appearance is in Mario and Sonic at the London 2012 Olympics