javelin (retrofit) (azur lane)
The kai/retrofit form of Azur Lane's Javelin, as seen in post #2906241.
In her kai form, she now wears a one-piece white dress with a sailor collar and pink ribbon, the most obvious points to note if she's not using her rig. She switches to wearing white thighhighs, with blue strappy heels.
This tag implicates javelin_(azur_lane) (learn more).