Here are all the obtainable Chao Faces that can be obtained through normal means.
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Sonic Adventure 1
Sonic Adventure 2
Neutral Chao have the biggest range of faces.
normal eyes / no mouth normal eyes / no mouth normal eyes / no mouth
Normal eyes half-closed eyes closed-up eyes (happy) mean eyes Chaos eyes;
No mouth V smile upside-down V frown grin squiggly mouth
Hero Chao eyes never evil.
Dark Chao eyes are always evil.