The less realistic, the better. And I DON'T mean anime style.
The more imaginative, the better (e.g. Voldo, Klonoa w/his floppy ears, limbless Rayman, Max from MDK2).
I love games with steampunk design (Strikers, Garegga, GW2, GunValkyrie) - familiar yet alien; as if from a nearby alternate reality.
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