I posted this somewhere else, but I'll post it in this thread too. People seem to be jumping to the conclusion that the island deities will follow the pattern outlined by Oricorio (Electric/Ghost/Fire/Psychic). While this is tempting, I'd like to propose an alternate theory: each of the island deities corresponds to a terrain move. With Psychic Terrain, there are 4 terrains, 4 islands, and 4 island deities. Tapu Koko's unique Electric Surge ability suggests that the other Tapus (or whatever) might have similar abilities for Grassy Terrain, Misty Terrain and now Psychic Terrain. On the other hand, the coloration is eerily similar to Oricorio (although Tapu3 is way more orange than red, so there's that), so I could buy either one. However, Gamefreak has been known to create Pokemon with color schemes totally unrelated to their type (see: Reshiram and Zekrom, who people couldn't figure out the types for until they were confirmed), so don't bank too heavily on color. I'm torn between which theory I'd prefer to be true, because Fire/Fairy is cool but so are more automatic terrains.