I like this a LOT.
I want a complicated cosmos for the DCU, with social change and cultural paradigms in flux from constant and conflict and interplanetary alliances. Thanagar is ripe for big changes, and possible dissolution. The THEME is Reincarnation!
Shayera's big theme is double agent/double cross... but her loyalties could be in constant flux from what's happening back home, and what's happening on Earth.