She and her sister were members of the Nikke squad Melee, a squad of mass-produced Nikkes which specialized in melee combat. In reality, the UFH was deliberately sabatoging their squad in a "survival of the fittest" where they were sent on increasingly dangerous missions in order to remodel the last surviving member as a Grimms model. Upon realizing this, Rose incited a mutiny and murdered their former commander alongside other members of their squad who opposed the idea. Scarlet would eventually clash her sister in a duel, resulting in Rose's eventual demise. Rose was also the original wielder of Fleetly Fading, Scarlet's signature weapon.
Over a century later, Rose would be resurrected through unknown means by "Mirror", an AI projection that mimics the late Red Shoes.
