Soft Stone is an inmate of Contrition's Figure. During the incident in the prison, they were trapped with Korin Kim and Blueberri Jin, and played a sort of three-person chess game with them using one of Declan's Corrective's poems.
Their head is a shiny, featureless chrome orb that can turn in a socket on their neck. They're hooded by their large orange, yellow and red shawl. Their spindly, rusty appendages are hidden under their shawl.
They can wink by making a pinging noise.