RAISE A SUILEN
RAISE A SUILEN is an all-girl band in the BanG Dream! franchise. The group consists of Raychell on lead vocals and bass, Riko Kohara on guitar, Natsume on drums, Reo Kurachi on keyboard and vocals, and Risa Tsumugi as DJ.
They were tentatively given the name THE THIRD(仮) before getting their official name which was announced during their second live.
Initially, the group was formed solely as a backup band due to the voice actresses of Afterglow, Pastel*Palettes and Hello, Happy World! being unable to play their characters' instruments, with the band giving the vocalists a chance to perform. However, they also have their own original songs. It was later revealed after the second live that they officially have become part of the BanG Dream! franchise, along with an official band name, RAISE A SUILEN, and a newly recruited member, Risa Tsumugi.
(Source: BanG Dream! Wikia, edited)