I suggested calling it Spirit before as traditional fairies are a kind of spirit, however it maybe overlap with Ghost. Maybe call it the Mystic type? It'll it could be like of combo of the fairy and magic type speculations.
Eh, I don't really like Mystic either. Maybe it's just me, I feel like mystical and psychic things go together almost, so those two types would overlap as well. If anything, I'd want to see it be Light, if it ends up existing. Just seems like to be a general thing that encompasses everything that's being speculated about. It still overlaps with Electric and Fire in a technical kind of way, but I'm kind of over that. It just fits better =P