96neko
96猫 (ku-ro-neko = black cat), formerly known as 響希 ナツメ (Hibiki Natsume)
A solo utaite who became famous through niconico. Although 96neko is often drawn similar to Kagamine Len (not necessarily male, closer to tomboy), in real life she's actually a woman. She later became a virtual youtuber.
See 96neko (hyt330) for her pixiv account.