Hitomi is a minor character who appeared in episode 55 of the anime.
She was a fan of Utau's and dreamt of meeting her face-to-face.
She dreams to become a singer someday and has the talent.
Lulu felt her doubts and so used her magic to provoke her into singing with all her heart. As she sang, she made everyone around her fall into a trance.
Hitomi became "Singer Dream" when Utau told her that her song made everyone's hearts empty shells.
She fought Utau and Amu in battle, but lost to Amu's Prism Music and later Utau's Angel Cradle. After some reasoning, Amu returned her to her old self, with her memories as Singer Dream removed.