Zoey Westen is, at this current juncture, getting possessed by Kenzi from Lost Girl. Although if I could find out more about Ksenia's character from the Locke and Key pilot (assuming it counted), I would go for that. Because it would be fun as FUCK, given what I DO know.

Siri Tachi is staying as is, because half the fun would be Obi-Wan dealing with his girlfriend suddenly being a viking, and alas, 'tis not to be. So she will be the straight man this plot. And dealing with everyone suddenly feeling WRONG in the Force will be interesting, too.