On one hand, Rey will be a lucky duck and not get killed by her doppelgänger before the event's end. On the other hand, you'll have a manipulative, underhanded mass murdering sociopath on the loose. Yay? Yay.

But she'll be interested in more than just sating her bloodlust. She will probably commiserate with any fellow doppelgängers and individuals who are inclined towards violence, as well as being a bit more forthcoming with dirty secrets than her original.

Rey's mental filter is already a bit of a joke, but expect it to be cranked down to negative eleven at this point. She will also express absolutely no liking for anything machine that possesses its own sentience, and regard them as soulless objects rather than individuals. So any robots/androids might have a unique reaction from her. The irony is that she is basically a "machine" herself, at the very core.

For a long while now Rey has been doing a pretty good job at keeping this side of her capped. The doppelgänger, however, will feel no such inclination. Rather than just attempting to go on a full-on spree, she is likely going to attempt to dispatch her counterpart in some way in order to commence being the life ruiner that she is.

So yeah, that's the gist of it. I have no solid plans yet but I am open to plotting with any current and new CR!