Here is a glossary for all the characters in VISUAL KEI SCHOOL, for the uninitiated.
table of contents
    Y/N: The main character, A.K.A. the reader. Y/N stands for "Your Name".
    Gackt: The former lead singer of the band Malice Mizer. Y/N keeps him as a pet.
    Atsushi Sakurai: The lead singer of BUCK-TICK. Y/N's best friend. Worst enemies with Yoshiki Hayashi.
    Wajow: The Gallo's guitarist.
    Nov: The Gallo's other guitarist.
    Jojo: The Gallo's lead singer. A big fan of JJBA.
    Andy: The Gallo's bassist.
    Kaede: The Gallo's drummer.
    Hisashi Imai: Guitarist for Buck-Tick.
    
    Yoshiki Hayashi: The pianist and drummer for X Japan. Worst enemies with Atsushi Sakurai.
    Miyavi: Guitarist for Dué Le Quartz and successful solo musician.
    Miura Ayme: Solo musician and the voice actor for Asmodeus in that Obey Me game.
    Kyo: Dir en Grey's vocalist. Often referred to as a 12 year old dwarf...
    
    D13: Vocalist in Leetspeak Monsters. Some kind of skeleton.
    Yuriko: Guitarist and leader of Kaneto-Juusei. Y/N's music teacher. Has a bone to pick with Gackt. Never actually teaches much.
    hide: Guitarist for X Japan and successful solo musician. Y/N's science teacher. Often goes wildly off topic.
    Uyuni: Simultaneously he is Leader and Support of Pinokiwo. Y/N's math teacher.
    iT: DazzlingBAD's vocalist. Y/N's fashion teacher.
    
    Uru: The bassist in Kaneto-Juusei. He looks really shady...
    Chill: Vocalist of Kaneto-Juusei. He appears to live somewhere inside the school..?
    Issay: Vocalist of Der Zibet. Atsushi's hallway crush, oooh!
    Kaya: The vocalist of Schwarz Stein and a solo musician. In bad blood with Kamijo.
    Kamijo: Vocalist of Versailles and Lareine as well as a solo musician. Enemies with Kaya. Has a secret.
    Nuppe: Bassist of Souiumono. Nobody really likes him when he transfers in...
    Hiro Bucky: Guitarist in Souiumono.