All I've ever thought of them is they are aggressive, can attack in a pack and have a fire based breath weapon. I don't know if they are actually demonic or or just a weird life form.
Normal hare-sized rabbits (black fur, usually) with glowing red eyes and a variety of attacks. Some like teeth and claws, some breathe fire, some are poisonous. Some are just argyle or polka-dotted. All of them are mean as sin. Sure they look cute, right up until they lunge for your throat.
Fire breathing, live in packs, red eyes, odd coat patterns like plaid or argyle, also they hold grudges. When cooked they taste like oil, not very pleasant.
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ETA: Of course, that doesn't mean there haven't been mutations since then. :)
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