Aisha and Thiria
Controlling Error's body, Shiro started to view what it was like inside her core. Despite being constrained to a small orb, the inside was akin to a vast void with planets that seemed to represent her identity.
From her old home as Anima to her mana realm, everything that she had ever experienced was here. Naturally, that included times where she had resurrected but didn't accomplish much unlike this life.
A life where she was a front line fighter with two daggers but failed to survive one of the dungeons and died without finding out about herself. A life where she only used wires since her body was sickly and fragile. A life where she couldn't use any mana at all since her links had been completely shut down and even a life where she was doing good but died due to a curse.
All of these experiences made up her core.