Inverted Ending:

"Those poor innocent children... Their parents fell victim to the Vengeful Ones' rampage over the "one," as they call him... Their parents were depending on their families to come home but they never came back. It was the devil's fault, they caused the vengeful ones and the one to be the reason.. It is our fault that children are scared of us mascots...

...and there is nothing we can do to fix it."

Shadow Lolbit Ending:

"Those monsters you saw are his minions. Those "monsters" are known as the viruses. That monster looks like Prototype Fredbear but demented... As for that red strange decapitated floating head, I don't know who that thing is but he should be avoided at all costs. I apologize for not introducing myself to you, william afton, my name is Shadow Lolbit, one of the angels who serve God. I apologize if my appearance was frightening at first, my darling, just note that I am here to protect humanity from the devil...Shadow Kennedy and Shadow Afton...they are behind all of this. What's that? Are you looking for a way out? Here, hold my hand and I will bring you to the exit, it will be a quicker and safer route to prevent you from being spotted."

Agent 49 Ending (True Ending):

"Is it a good day, William? It's me, Agent 49... I am speaking from the clouds.. I like it here, and I hope to see you there too someday...

...

...I just can't believe it. Those things used my body for...THAT. I could've prevented this...if I didn't work for Jack Kennedy...I miss my family, and I hope to see them again on the other side.. Where's Joseph...?...Did I try to hurt him?

William Afton: ...No. You didn't try to hurt him, your corpse was being used by two sickos.

Agent 49: ...And they are?

William Afton: Shadow Kennedy and Shadow Afton.

Agent 49: Shadow Afton...you mean..the same one from my nightmares?

William Afton: I don't know who.. oh, I know who you are talking about!

Agent 49: Yeah...

Well...see you on the flipside.

...Goodbye."