2. Is a shitty idea. She works great as a "fangirl" type character, a sort of everyteen girl that lots of audiences can project themselves onto. Like a modern Peter Parker that doesn't suck and isn't written by Michael Guy Bendis The Writer.
3. Is a fantastic idea. Kira specifically (both versions) would work really well as a villain that actually blends into the setting, and would really work the best aspects of the setting in.