Character development is over-rated if the character isn't likable to me.
Felli is pure fluff for me and that's about it. Cute to look at, has her funny moments, but there isn't a female in the story that really draws me in. I'm in the show purely for the frills, thigh highs, and Layfon kicking some hardcore ass.
Nina's just an eyesore and one I'm practicing tuning out. Lets just say if I knew someone like her in person, we'd NEVER get a long and she'd be put in her place rather quickly with her ideals.