Purple Man (also known as Purple Guy) is a purple killer known for killing (10–15?) children. He is the man inside the springlock suit. He is also responsible for destroying the animatronics in 1993 (I believe) and getting springlocked and stuck there for 30 years.
I also have evidence. Fazbear’s Fright is set in 2023, 1993+30=2023. He has been stuck there for 30 years, proving my evidence.
Now why does he kill children? Some people believe that he cannot control his sanity and a dark glitch is controlling him during the killing of the 5 missing children. The first 5 children were the spirits of the toy animatronics. Their names are unknown but people have given them names. The 5 children that we know have been murdered are Jeremy, Cassidy, Gabriel, Susie, and Fritz. They control the OG animatronics.
Also, some believe that he did it all himself and he needs to suffer/pay for what he has done. There’s no way you can prove me wrong because it’s impossible for Purple Guy or William Afton to have died in 1992/1991/1990/1987 because Fazbear’s Fright is set in 2023.
Now here’s the important part you need to pay attention to: the minigames.
In one minigame (FNaF 6 I think) the puppet is looking at children that look like they’re bald. But it says to not let in the child with the green bracelet. If you don’t let her in you can see her jumping asking for help as she fades away. To know what happened, you can see in one minigame Fredbear or Freddy is giving cakes to children to make them happy. Except there’s a girl outside crying. That is the girl with the green bracelet (also known as Charlie/Charlotte). And then a purple car pulls up and Purple Guy murders her. That is Purple Guy’s first ever target.
In the FNaF 3 main menu you can see Springtrap is trying to get out of his suit, but he can’t. That’s William/Purple Guy trying to escape, but he can’t.
In UCN you play as William Afton. Every animatronic is there because you’re suffering and it’s your hell before going to actual hell. Scraptrap, Springtrap, Burntrap are all William, even Glitchtrap.