Kurofusa Suguri/Hearty Cassis, from Evil Mud Wallowing Princess Muddy Cherry, a manga series by Devildance.
She has more what-if side materials than her friends, despite not being focus of the series.
Also, I didn't knew how to describe the hair of her magical form, so I just went with alternate hairstyle for a tag.
Description
Suguri - kurofusasuguri, 1girl, solo, black hair, very long hair, blunt bangs, hime cut, double parted bangs, hairclip, red eyes, medium breasts, shirt, long sleeves, juliet sleeves, sailor collar, ascot, pinafore dress, pantyhose, mary janes,
Hearty Cassis - heartycassis, magical girl, 1girl, solo, blue hair, very long hair, blunt ends, alternate hairstyle, medium breasts, hair ornament, choker, sleeveless shirt, heart brooch, elbow gloves, circle skirt, knee boots, high heels,