My theory on how became the BV Vengeful spirit
Across medias from games to books, I always found something interesting when it comes to a hostile or vengeful character becoming friendly and childish. I'll be displaying some of my findings here.
Let me start with the games.
SOTM
M2 (The Mimic)
The mimic is as characterized to be a hostile, intelligent endoskeleton that would kill basically anything. His rage comes from the agony of Edwin Murray's destructive outburst on him, but there are parts of David Murray within him which is shown through the secret ending of SOTM.
In order to subdue the Mimic, we must put together David's bedtime story and put him to bed. We are reminding David of the parents he had, just as Happiest Day allows BV to rest with recovered memories.
FNAF SB: RUIN
Daycare Attendant
In RUIN, Daycare Attendant is split between two personalities. Sun who is scared and oppressed by Moon says he is "trapped in a nap", and Moon who is hostile and hates the lights. We are tasked by Sun to turn on the generators and reboot him for him to become "whole." I interpreted this as a parallel to Golden Freddy, when sun says he is "trapped in a nap", I pictured BV being stuck in the memory of Happiest Day. Moon is shown to hate the lights, which could be how Golden Freddy felt about birthday parties.
When Cassie turns on the generators and reboot him, The Daycare attendant's personality turn from scared and hostile to childish and cheerful, his first words being "Happy Birthday!"
Books
I will be focusing on mainly the Fazbear Frights books as they are said to fill in the blanks of the original story.
Andrew
The character Andrew is a direct parallel to The Vengeful spirit. Some even believe that Andrew IS the vengeful spirit as how close he is to being that, but I'm not the type to assume since he's the vengeful spirit in Fazbear Frights, he has to be in the main games too. I believe Andrew gives us an idea on how the Vengeful spirit thinks.
Andrew is characterized to be an angry, and vindictive spirit that lashes out at people.
Here is a paragraph from the books that can give us an idea why the vengeful spirit is so vengeful.
Notice how Andrew DOESN'T remember what happened to him. He doesn't remember WHY he was so angry with this man. He just had a FEELING that he did something to him, and so he wanted to make him suffer the way he made him suffer. Keep in mind, Andrew doesn't remember HOW he died, this will be important later on.
In order to free Andrew, Jake focused on his own memory to save him, by turning himself into a massive baseball bat and swinging at the Afton-like creature and letting Andrew borrow his memory.
Attaching
Andrew says that he attached himself to the man he felt hurt him, and he kept him alive when he should've died. Many assume this was him referring to FFPS ending with the fire, but I believe this is when William Afton was springlocked in the suit. Using the story "Hide and Seek" with Shadow Bonnie, it shows a character named Toby destroying an arcade machine and afterwards having a shadow bonnie attached to him.
Toby destroyed the Hide-and-seek machine
Toby destroying the arcade machine could parallel to William Afton dismantling the animatronics.
The story uses the word "attached", just as Andrew said he did with the man.
Throughout the story, Shadow bonnie torments Toby and feeds off his suffering.
Later in the story, he comes back to the location where he destroyed the game, and arrogantly kills himself as a way to "win." Sounding very similar to Afton's death in FNAF3
Memory Borrowing
BV's memories are the key to set him free, but how can he be set free when he can't remember anything besides a party for him? That's when Marionette or should I say Cassidy comes to save him. Using the clues above, I came to the conclusion that Cassidy let BV borrow her memory. In FNAF 3's Mangle's Quest, I think that Cassidy went into her own memories to retrieve a cake to let BV have. In Mangle's Quest memory, what is shown is a sad Marionette figure with NO spirit within.
No dead kids here. Just a sad Marionette and cake.
This would explain the girl in the logbook not being BV, but Cassidy herself.
A sad puppet, and a cake with a girl.
Many interpretted this as Cassidy being the reciever, but what I believe is that this moment here is an representation of the memory where Cassidy is recieving a cake, so she can use this memory to save BV. Just as Jake did with Andrew, using his memory with his dad at the baseball game, he formed himself into a giant baseball bat and let him use his memory.
Vengeful Spirit
What we gather from Andrew from FF books is that he was a vengeful spirit who didn't have any memories of how he died, he attached to himself to a man he felt pain from and kept him from dying. BV is a broken spirit who doesn't have any memory besides a party for him, as shown through the examples, he was an angry and restless spirit but also a scared one. Yet the Vengeful spirit affirms himself as "The One You Shouldn't Have Killed", that should mean that William Afton HAD to have killed him in order to resent him so much, he held him down and tortured him within a dream, right? I don't think so.
In order for a spirit to possess something, they MUST feel pain towards that thing. Pain is what guides the spirit to it's body. BV, who has no memory of how he died, except for a party made for him, attached himself to Afton purely because he FELT pain from him. He felt he did something to him, and was the cause of his suffering, so he wanted him to feel the same pain that he gave him. (Under BVExperiments, this could relate to that.) Vengeful BV must have assumed since he felt so much pain from Afton, he was the reason he was dead.
As the endings shown in the books and the games, the vengeful spirit eventually passes on after recieving a memory from someone else and goes back to his roots, resting peacefully with his memories now intact.
That's all I got for now, this was just my interpretation of how BV became vengeful using the clues that Scott laid out for us. If you had found something that I missed, please let me know! Otherwise, I hope you enjoyed my theory.
Thank you for reading.
