Ryou Mimasaka the Gorgon Shell from Air Gear.

The anime outfit is the most stable.

The tattoos aren't a stable shape, but they generally stay towards the same silhouette.

The arena she is fought in as a member of Behemoth is included.

Her outfit from Chapter 160 of the manga is usable as well, though it has a large preference for her coat being open (even though it wasn't open). Using dynamic pose gives a better chance at the coat being closed.

Preview images for Illustrious and Pony used Adetailer.

Call tag: ryoumimasaka

General Outfit (common to all): hair ribbon, red ribbons, black gloves, fingerless gloves, black kneehighs, red airtrecks, red roller skates

Anime Outfit: strapless red bra, red panties

Manga Outfit: red heart pasties, red thong

Behemoth Uniform: grey t-shirt, black bike shorts, yellow stripe

Character: black hair, ponytail, grey eyes

(optional): tattoos, glowing tattoos

Background: ceiling hatch, light, tiles, tile floor, tile walls, tile ceiling, light grey floor, light grey walls, light grey ceiling

(bonus) Chapter 160 Outfit: garter straps, black stockings, black bra, cleavage, dress, yellow skirt, yellow shirt collar, white coat