Yakumo Shinonome

We learn from memory echos that Yakumo Shinonome lived in an orphanage alongside Emily Su, Miguel, Riki and others before being adopted by Juzo Mido with other orphans. They were used in inhumane human experiments. While they wanted to escape the cruelty, Yakumo and the others were unable to. Yakumo could cheer the others up by making onigiri (rice balls) for them. This was all before the Great Collapse.