Total yandere.

yeah.
s1: Falls for Fate, Starlight Breaker.
s2: Asks Vita's reasons politely (if briskly) twice. Divine Buster after both. Falls for Hayate, seals Reinforce.
s3: lovingly trains the extras. Crossfires Teanna. Twice. Makes Subaru watch. Also, Starlight Breaker on Vivio.

Which reminds me. How does one not get in trouble with child protective services after starlight breaking a child?

She saved the world by beating the shit out of the kid she adopted.