josh_(rog_rockbe)
Original character by rog rockbe.
Her name is literally 助手 (joshu, helper/assistant). Regarding the romanization, the artist has used "Josh" in several pieces. See pixiv #43175144 and pixiv #45907435.
She has long hair over one eye and usually wears a lab coat, red bikini top, thighhighs, undone belt, and large wrist cuffs.