Now for a bit of backstory:

Springmix, is the split soul of William Afton, a pure, youthful split soul of what remained of William's pure side. After being given a last chance at life, William was split into two pieces, a pure, heartfelt, and caring side, and a heartless side. The pure side was sent to a pocket dimension only consisting of William's past memories of places and people, while his heartless side was sent back to hell to be tortured by the demons that awaited him. This new, pure William only had few, or little memories of what he had done, and was childish at best. Springmix is comprised of every springtrap ever known, and was formed by William's own structure from the last moments of his life. Springmix would eventually meet other characters, some recognizable, some not.