In the game Pizzeria Simulator (FNAF 6) when you play the maze mini game, you will see a little blond girl looking for her dog. The girl (Susie)'s dog is dead and can be shown in pixelated form, as dismembered.
William’s children Elizabeth and Micheal where abused and end up abusing others. For Elizabeth she becomes a murder crazed robot that is obessed with pleasing her serial killer father. For micheal he bullied his younger brother which resulted in his death, then there is debate over whether he frees the souls of the kids killed by William or he is working under William and collecting the souls to use for evil. Henry is also implied to be abusive to Charlie and Charlie ends up dying at the hands of William and becoming the puppet and killing the nightguards in an attempt to protect the souls or as an anger outlet depending on what you believe. Many of the main animatronics also have the souls of the murder victims inside them and often lash out trying to kill the night guards we play as. A lot of the lore is sparse or implied which is why it can be hard to tell what they story is trying to say and there are many theories or interpretations
In FNAF world and FNAF 3. In FNAF world you intentionally glitch the game to get to different areas. In FNAF 3 you hallucinate phantom animatronics when you look at them for too long or the ventilation stops working, they don’t kill you, just stun.
In FNAF 4 there are clues to imply the crying child was terminally ill after being hit by an animatronic, suffering brain damage and being in a coma, and died shortly after
Elizabeth is abused and wants the approval of her father even when she becomes Circus Baby saying “I’ll make you proud daddy” and working with her father to kill and torture people
The fourth game depicts a child being restrained by older kids in a pixelated art style, the dialogue indicating that the child is trying to free themselves
In fnaf three it is shown that Springtrap gets burned alive on the last night. Also in sister location it shows a fire in one of the endings, as well as in Fnaf 6 Henry as well as Micheal (who you are implied to be playing as) is burned as one of the endings.
The bite of 83, in fnaf 4 is a sequence after one of the nights where a small child, is put into the mouth of the Fredbear animatronic where his head is crushed.
You pass out from lack of oxygen in fnaf 3, the character we play as is also burned alive in one of the pizzeria sim endings, which isn’t shown but your screen goes black as the temperature rises and flames are seen
In fnaf three, there is a mini game where the purple guy, William Afton, gets spring locked by the spring Bonnie suit, unless you read the book description of what happens in a spring lock failure in Silver eyes, there is no other torture.
In fnaf 1 there are the original 7 children who are murdered. Gabriel, Jeremy, Susie, Fritz , Cassidy, and Charlie. Although Charlie is only mentioned in fnaf 2. Elizabeth dies in Sister location or FNAF 5, and C.C dies in Fnaf 4.(the bite of 83)
Henry Emily, was a father of one before Charlie died. He burns alive in Fnaf 6. If you count William afton as a parent then yes, he does die. But he is reincarnated into many different forms.
Circus Baby from Sister location in fnaf five the design of a clown. The only other animatronic that resembles close to clowns is Music man from Pizza Simulator or FNAF 6.
There is a certain audio of William springlock failure, but is not played in any of the games. There is a sound effect for the scooping machine in fnaf 5.