What i like here is that you have protrayed one of the best plot tools imaginable and did it well.
Plus throughout this story you have portrayed Luna as her canon personality and not changed her into a mystic superwoman as some tend to do!
Trying to write a 'real' Luna has been one of my main objectives. That's not to say I don't enjoy some of the ways fanon!Luna has been portrayed.
You've mentioned superseer!Luna, already, and there is also mask!Luna where she's just pretending to be odd.
I think either of those options end up turning Luna into something that she isn't, which I think does her a disservice.