maybe some of you have seen this, i'm not sure. her name is ミラクルひかる (Miracle Hikaru) and she's well-known for doing Utada but she does other artists as well. she's pretty funny most of the time. anyway, i found this video on youtube of her imitating ayu. lol
**EDIT: if you'd like to see one of her regular acts on TV, i've included a youtube video of that too. she does utada so well! hahaha