| Birth Name | Naoi Rei (直井れい / 나오이 레이) |
| Stage Name | Rei (레이) |
| Birthday | February 3, 2004 |
| Nationality | Japanese |
| Height | 170 cm |
| Blood Type | A |
| MBTI | INFJ |
| Group | IVE |
| Company | STARSHIP Entertainment |
| Position | Main Rapper, Sub-Vocalist |
| Korean Name | Kim Rei (김레이) |
| English Name | Rachel Naoi |
| Positions | Main Rapper, Sub-Vocalist |
| Zodiac Sign | Aquarius |
| Chinese Zodiac Sign | Monkey |
| Representative Emoji | 🦋 (Butterfly) / 🐥 (Baby Chick) |