The Archivist

the soul that eventually comes to inhabit stitchcraft

They're downright obsessed with the past, would regularly break into old pizzerias to just steal everything they can for "preservation". Animatronics, posters, you name it, they'd steal it. Only thing is of course, these pizzerias tend to be abandoned for a reason.

Dresses up as a construction worker when breaking in and taking things, as people tend to avoid questioning someone wearing hi-vis.

Has a bit of an obsession with the stitchcraft character in particular. Went to the place as a kid, now idolizes anything involved with it and puts in special effort to preserving it. 

Once they discover the original stitchcraft animatronic, they're willing to go to dedicate themselves to its repair, even if it takes them to dangerous places.