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The One You Shouldn't Have Killed is the mysterious, mostly unseen, protagonist of the non-canon Five Nights At Freddy's game, Ultimate Custom Night. He is responsible for William Afton's seeming inability to die and the fact that the nightmare animatronics had physical forms. It is also possible that he is the cause/creator of the purgatory-like dimension that William Afton is trapped in. 




Ultimate Custom Night 

It is most likely that the one you should not have killed is the likely leader who is commanding the anmatronics in the dimension that William Afton is trapped in and has the inability to die.

Quotes

I am remade, but not by you, by the one you should not have killed.
~ Nightmare Freddy
Greetings from the fire, and from the one you should not have killed!
~ Jack-O-Chica
He's here, and always watching, the one you shouldn't have killed.
~ Mangle
I̷̡͢͡ ̡͝͏̕h̷̷́͘͞à̶̡̕͝v̡̨e̕͝͏̀ ̷̶҉s̴̸͡͡e̶̷͡͠é͝n̴̢̨͞ ͘͟h̷̶i̧͜҉m̶̢͟͠,҉̕ ̴͡t̡͝h̷͡͝e̴̕͞͡ ̧o̸̧̧̧͝n͏̷̡͞e̵͢͏̨͘ ͟y̷̡͢o̴̷̡̕͠ù̷͜ ̀͜͜͞s̷̡̀͘͠h̸͡o̷̵̢͞͝u̶̕͡l̀͝d͢͏̢́͘ņ̸͡'̷́̕͞͡t̀͟ ̸̢͘͟͡h̡͞͠a̛͢͞v̴̸e̴̡͏̢͜ ̛͝͝k̡̡̡̡͡í̵͝͞l͘҉̶ļ̷̕ę̀d̕͡!̨́̕͟͟
~ Withered Chica






Triva

  • It is most likely that the one you should not have killed is some sort of leader.
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