Her stage name is Anonymous, or Anon for short.
She is 5'7" and her real name is Lilly Waters
She keeps herself anonymous with her masks and her role in the band is to play the drum machine that Murdoc made to replace Russell in phase 2 (or 3 I can't remember exactly) she also sings back up, so for example, the Lala lalala part in 19-2000 is basically what she would sing if they performed live while Noodle sang her part.

She is a precious child and my friend insists on shipping her with 2D. I never usually ship my OC'S with the cannon characters in fandoms, but what do you guys think?