Triple Threat

Question: The idea of Duality as the Slavic PSP didn't ever work for me, but it IS a very common element in mythology for gods and goddesses to have multiple aspects. How would y'all handle a PC developing into a dualistic or triadic figure, with each aspect having different proclivities?

I'd say a lot of that needs to be on the player who wants to do it (which is probably fine - I've found that players love doing crazy ridiculous stuff to further their own Legends!). There's no mechanic for actually being different people at the same time, but that doesn't mean an enterprising PC can't find a way to invent one!

Illusion, of course, can take care of appearing as two or three people with facile ease; it's available as early as level three with Doppelganger, and higher levels of Illusion can pull off ever more complex and artistic representations of a double or triple aspect. More solid representations of other aspects could easily be created with any of the elemental purviews (there's no reason I wouldn't let a Scion stunt an Earthborn Spirit, for example, so that it looked just like her) or built with plants for those skilled in the Fertility purview. Then there's also the Appearance option - high-level Appearance knacks can do totally wacky things, and you might be able to run with this idea a number of ways, from just appearing as a different one of your "aspects" all the time to actually creating a body with several torsos or heads. I'd definitely also allow things like creative use of the Intoxicate boon to cause viewers to see double or triple, or even for enterprising science-minded Scions to create a drug (perhaps dispersed through mist or some other convenient way?) that has the same effect without needing to use powers at all. Moon boons might also cause peculiarly specific temporary madness that encourages such a view of the Scion. And, of course, Scions are so shockingly better at everything than mortals that it's not even necessary to use powers to pull this sort of thing off; you might be able to use good old fashioned smoke and mirrors without anyone ever being able to see anything but the awe-inspiring front you put up. And don't underestimate the power of social knacks, either - a little Rumor Mill can go a long way toward convincing even people who have never seen you of your multifaceted amazingness. Show me an awesome stunt, and I will show you a mortal that probably totally bought it. As far as separate personalities and proclivities go, that's something that an individual god can play up at their leisure as well - want one aspect to be known as a carefree lover and sun-goddess? Great! Do that while in that aspect, and do other things in the others. Most players who are really dedicated or excited about the idea of being a multi-personality god will police themselves on that better than an ST would.

There's also always the option, especially at the Demigod or God jumps, of giving them some kind of Birthright that furthers the image, whether it's a couple of Guides that embody their other aspects or even an invented Birthright that is another aspect, requiring X resources to swap to and providing X bonuses that are different from normal. There's plenty of room to work with that, especially if it's something the PC really wants to be a defining factor of their Legend.

I'd say that if a player is putting effort into being seen as a duplicate or triplicate god, and they're trying some of the above or coming up with their own ways of pulling it off, let them. Humanity will totally run with it. And if you want to get even crazier, perhaps by doing some kind of insane stunt once they're gods wherein they bind other low-Legend deities to themselves in some kind of insane Wyrd-ritual... hey, if they're that dedicated to the idea, I'd help them along as long as they were working toward it in some semi-reasonable way.