In order of appearance in image:
Hero Chao
Spawns in extreme hill biomes.
Can be tamed and bred with Blueberries.
If it likes you enough it might try to defend you from mobs.
Can be tamed and bred with Blueberries.
If it likes you enough it might try to defend you from mobs.
Companion Chao
Spawns in plains.
Can be bred with Blueberries.
They're non-hostile and don't do anything except float around, looking adorable.
Can be bred with Blueberries.
They're non-hostile and don't do anything except float around, looking adorable.
Lonely Chao
Spawns in forest or by rivers.
Just an ambient mob.
Will probably try to run away from you.
Just an ambient mob.
Will probably try to run away from you.
Nesting Chao
Spawns in jungles.
Hostile.
Fast but usually alone.
Hostile.
Fast but usually alone.
Dark Chao
Spawns in the Nether.
Hostile.
Usually spawns in packs.
Hostile.
Usually spawns in packs.