Oh gosh, Leto. Your post made me at first think of cross-breeding Unicorns and Sims themselves. Imagine Sims with huge horns trampling around on four legs. Centaurs, maybe? I can just see in my mind's eye right now a Unisim headbutting some toddler. I don't know whether to laugh, cry, or wash my brain of this horrid/funny image. It's like... I don't know how to react.
That was off-topic. Gee. Um. Evil Sims could sell the horns for a heap of money or something?
The new life state would be a biped, so Werewolves would probably make a comeback. Or Satyrs. If we get satyrs, I'm trademarking the idea of a Narnia Legacy. My founder should be Mr. Tumnus. Hehe.