Rusty Rose is an alternate-universe version of Amy Rose in Sonic Prime. She appears in the Grim world, where she has been transformed into a hardened, armored rebel fighter. Unlike the cheerful and optimistic Amy from the main Sonic continuity, Rusty is more serious, battle-ready, and independent. She plays an important supporting role among the resistance forces opposing the Chaos Council and helps Sonic during his journey through the shattered Shatterspaces.