First member across all 48 and 46 groups who became a group's overall center despite not being part of its first generation.
Her nickname (Kosakana) is her name without the 'o' in the end, but also means 'little fish.'
Known to be a big fan of reptiles and dinosaurs. The Instagram account created to promote her first photobook was called "Kosakanatops", a portmanteau of "Kosakana" and "Triceratops"
Has a calm personality
Before it was announced who the hosts of Hiragana Oshi would be, the members were asked who they wanted to have as host. Nao was the only member to choose Audrey, the comedy duo who was eventually selected. Her reason was "they are good at talking, so I thought it was sure to be fun if we had them as MC."
For this reason she has been nominated as co-host Wakabayashi Masayasu's favorite member
Ranked first in the Lucky Girl Ranking 2019 on Hiragana Oshi.
Close friends with Kamimura Hinano. On a segment on HINABINGO!, chose Hinano as her ideal little sister and Hinano chose her as her ideal big sister.
On June 26, 2021, it was announced that she would suspend her activities with the group due to bad health.
Is currently on hiatus since June 26, 2021 for health reasons.