...Yeah, that's one weird name. Go with something entirely non-descript. Just label them similar to some other series you (and only you) watch, but spell the name a bit wrong as a tell to you. As is, a strange name might spark interest. "Oooh, I've never heard of "Your huge ----: Enmity isn't Mundane" I think I'll check it out." Then bam, they know you're a Brony. And then they'll be one too.
Otherwise, just go with horse. The rest of the title is already way out there, may as well have something remotely recognizable.
Or you could, I dunno, not care what other people might think if they see it.