I haven't actually seen Gravity Falls, but I went and looked up who/what Bill Cipher is, and I think you're right. The Dreaming (given my essay lmao) is filled with creatures along the same lines. To Katie, he'd register as a chimera from the Dreaming so closely she'd just assume that's what he was, even if he's from a different universe-- an especially powerful/old one, given he can be seen by others too.
They're not the same species, but fae and chimera are very closely linked and have an interesting relationship, so. :D
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They're not the same species, but fae and chimera are very closely linked and have an interesting relationship, so. :D