Fujiwara no Mokou. Her backstory is compelling and tragic, her powers are absolutely badass, and she has that bifauxnen charm that always seems to get me weak.
Bit of warning, tho: Rogue One might actually be the greatest Star Wars film I've ever seen. Strongly recommended
Impossible. I haven't seen it, but no matter what happened in it it will never be as amazing what happened in Legend because Disney sucks and they said that Kyle Katarn doesn't exist anymore.