>>528648006
Dess appears in the Undertale alarm clock dialogue as Rudy's daughter without Asgore mauling her for her soul, and has antlers in Tenna's flashback.
>>528648046
Still more common to have antlers than to be without them, and you'd think a striking feature that could give a unique silhouette like that would be included. A short tail isn't as integral to a silhouette as antlers and it's hidden by Susie's jacket.
I will concede on the banishing, though. I can definitely see Susie not wanting to be separated from the dark worlds and breaking the prophecy that foretells it. Finally, a good alternative to the idea that the final prophecy is one of the heroes dying.
Sorry for the late reply, internet was acting up.