- Birth Name: Aritomo Tsugumi (有友緒心)
- Stage Name: GUMI
- Birth Date: September 7, 2004
- Birth Place: Chiba Prefecture, Japan
- Blood Type: B
- Height: 159.5cm
- Foot Size: 23.5cm
- Special Skill: Impersonation, flute, ballet (2016), recover physical strength by sleeping while standing on the train platform (2019)
- Hobby: Watching comedy videos, Impersonation
- Favorite Animal: Dog (French Bulldog)
- Least favorite food: Coriander
- How do you spend your off day: Laze around
- One Thing that is non-negotiable: Eating dumplings with ponzu (citrus-based sauce)
- Favorite dish in lunch box: Uranai Gratin
- Favorite Color: The color of Shibazuke Pickles
- One Thing that is non-negotiable: I don't eat natto (fermented soybeans) with rice. I eat it as it is.
- Something that made you happy recently: My younger brother relied on me for studying
-  Hayako-sensei, Kekkon Surutte Hontou desu ka? - young Tachiki Hayako (Ep. 1)
-  Gisou no Fuufu - young Kamon Hiro (Ep. 8)
- Grand prize winner of Sanrio Puroland "Let's Play! Audition 2012" (遊んで！オーディション2012).
- Member of idol girl group @onefive since October 2019.
- Former member of idol group Sakura Gakuin (May 2016-Aug 2020).
- 2nd Hamidase! (はみだせ!; Stand Out!) Chairman (2019 Nendo).
- Member of sub-unit The Purchasing Club.