Mike Heller is an American drummer known as a member of the industrial metal group Fear Factory, the technical death metal band Malignancy, the British heavy metal band Raven, and rock band The Lucid alongside bassist David Ellefson, guitarist Drew Fortier, and vocalist Vinnie Dombroski (Sponge). Heller also formed the band System Divide and is a session drummer with credits in many genres.

Saki is a Japanese heavy metal musician and songwriter. She is best known as guitarist of the all-female band Mary's Blood from 2012 until they began an indefinite hiatus in 2022, and was also a member of the all-female band Nemophila from 2019 to 2024. She is currently active as a solo artist and as one-half of the duo Amahiru with Frédéric Leclercq. Saki has been sponsored by Killer Guitars for over ten years, and often uses custom-made Fascist models. In 2021, they released her signature model, the seven-string KG-Fascinator Seven the Empress.