Due to her mature attitude, she has a tendency to keep a certain feeling of distance with others.
Rei has fair skin and smooth dark-brown hair reaching her top back with no fringe, but bangs that cover her ears and lightning blue eyes.
Her outfit consists of white shirt with a wide neckline and long sleeves to her wrists, slightly torn jeans, and a black sleeveless jacket open until mid-torso.
She carries a studded belt with chains made of silver on her right hip, a leather bracelet on her right wrist, and a black bracelet on her left wrist. She also wears two necklaces, and her shoes are high ankle boots with black shoelaces.
- She is a professional singer who can sing any song. She has also loved singing ever since she was young.
- Tae and Rei's relationship is based on the real-life relationship between Sae and Raychell.
- She attended the same music school as Tae and Arisa.
- In addition to temporary part-time singing jobs, she used to play bass as a back up band for famous artists.
- She shares her birthday with her voice actress, which is also the date of THE THIRD's performance at GARUPARTY in Tokyo! as a backing band.