There are eight artists with this name:
1) MIMI is a Vocaloid producer who debuted in 2016 with Lapis Lazuli. Her works combines the synthetic voices of Vocaloid with intricate piano instrumentation across a wide range of genres and styles, including pop, piano rock and ballad. She once exclusively used Hatsune Miku for vocals, but has since started using other vocal synths including CeVIO KAFU, and more recently, SynthV Kasane Teto.
2) Former singer for the band Hugo Largo.