She is a member of the group
Milky Holmes, formed by the four main voice actresses in the media franchise
Tantei Opera Milky Holmes. Similarly, as
Nico Yazawa, she is a member of the singer group formed by the nine main voice actresses in the media franchise
Love Live! and has released singles under the fictional group name μ's. She is also part of a mini unit within the
Love Live! the project called BiBi, alongside
Yoshino Nanjō and
Pile. Tokui is also a
manga artist whose work, including the
4koma Mahou Shoujo Jitaku-chan, has been serialized in
Otapoke magazine. Her manga
Makeruna!! Aku no Gundan! has been made into an anime series. She describes herself as an
otaku, and has mentioned in particular her love for
Neon Genesis Evangelion and the character
Asuka Langley Soryu, whom she
cosplayed at a screening of
Q Evangelion. She credits
Yūko Miyamura, Asuka's voice actress, as her inspiration for becoming a voice actress. In late March 2020, Tokui made her YouTuber debut with the message in the English translation, "I am interested in many things, so I want to challenge everything!" As of late 2020, she uploaded her official
Virtual YouTuber avatar. ==Personal life==