Chao in Sonic Chronicles: The Dark Brotherhood

In Sonic Chronicles: The Dark Brotherhood, Chao eggs can be found scattered throughout the game, from Green Hill Zone to the Nocturne fortress. Chao hatch from these eggs over time, and are deposited in the "Chao Garden" (which is not an actual accessible location as in the Sonic Adventure games, but can be viewed from the game menu).

The various chao which hatch have profound usefulness in the game's combat system. Equipping a fighting character with a chao confers a variety of different combat advantages.

List of Sonic Chronicles chao
There are 40 different chao in all, although multiple copies of each can be collected.