This is kinda a wierd question, but I'm on a panfandom RP, and while not Nero's Master, a character I play had sort of been living with her for a while.
Aliasse from the Valkyria Chronicles series, to be precise. Now, it's been several years since I first got her, so she's basically developing a heck of a figure more akin to Selvaria. She usually uses firearms over her powers, but she gets a blue fiery aura, glowing red eyes, her hair floats, and her voice echoes when she does.
Aliasse circa a few years ago:
http://db.fowtcg.us/cards/vin002/047.jpg?20170616
Her figure is basically favoring the chesty/well-developed side at this point though.
Aliasse has a wild, and a bit of a violent personality. She can be uncultured, although she loves flowers. Ali was to the point where she considered Saber to be an aunt figure.
Anyways, to the point... Ali never developed much of a fashion sense, and the person mostly likely to care in her life was probably, well, Nero.
I have some friends who've said Nero would probably encourage her to wear more revealing outfits, though I wanted to ask you all what direction Nero would probably influence her in.