Oomori's music style is influenced by idol culture and punk rock among other clashing musical styles, and she is considered one of the early pioneers of the "anti-idol" and alternative idol scenes led by groups like BiS that would eventually give way to the more popular Kawaii metal movement, utilizing shock value and performance art throughout the early parts of her career.
[1] Starting from 2007,[4] Oomori performed in one of Kōenji's "live houses" named Muryoku Muzenji, singing while playing an acoustic guitar.
Later that year on 9 November, ex-BiS and Maison Book Girl member Megumi Koshouji debuted her new idol group MAPA with the full-length album Shitennou, produced entirely by Oomori.
In 2020 she publicly revealed her husband's identity as Pierre Nakano of Ling Tosite Sigure,[10] also the long-time drummer in her backing band.
[11] On August 18, 2024, the day that would have been their tenth wedding anniversary, the couple announced their divorce through their respective social media accounts.