We need a theory about him

The thing is is that shadow Bonnie’s backstory and lore is kinda already unfolded so there isn’t really any point too making a theory

Then what’s his part in the lore, and why is he in fnaf ar, and why is he a “secret” character in unc?

No I’m not saying he has no lore or backstory and that stuff but most of it has been uncovered or theorized like the fact he and shadow Freddy might be employees that got killed by the springlock suits and she came ghosts because of the sorrow they get for the children .smth like that