So I think mangle is still around in FNAF 3 from the rare instances when you see it and it isn't like the other phantom anamatronics, it's not burnt. This made some sense in my head so don't judge.
You put down the tablet and sighed. Nothing was going to happen on the first day anyway. Phone Dude said they hoped they'd find something but they hadn't yet. You sat back in your chair, not wanting to leave the office into the creepier part of the attraction. Why did you sign up for this job? Oh that's right it's because your father worked at one of the previous places where he died.

You picked up the tablet again only to see a white haired mangled boy hanging from the ceiling. He had one black eye and one yellow one. Two white Fox ears were attached to his head and he wore a pink bowtie. You screamed and dropped the tablet, checking the ventilation in case it was a hallucination. Everything was working right so what was that....

You were terrified and shaking when you saw the two ears in the window. You shook even more and wondered if this was how your Dad felt when he died...
"You don't need to be scared of me," the jittery static filled voice came from the male hanging from the ceiling in front of your face. His jaw hung awkwardly, you realised this when he stood in front of you. He looked like he was in a lot of pain.

You calmed down quite quickly and grabbed the animatronic fixing kit you had with you. It belonged to your Father and you thought that if anything happened maybe you could stop one of the killers from killing you. This boy wasn't going to hurt you though, you were sure of it. You took a screwdriver and fixed his jaw, then the rest of his limbs. He sighed with relief.
"Thank you..." He smiled.
"That's not all," you found a spare eye in the kit, titled 'Mangle part'.
"Are you Mangle?" You asked. He nodded. You fixed his eye back and he grinned.
"Thank you so much!" Mangle hugged you, "What's your name?"
"I'm y/n," you answered, blushing slightly. Mangle released you from the hug and sat on the desk in front of you.
"Thank you y/n. For once I'm not in pain. I was a take apart put back together attraction.... The kids really hurt me," he looked at you sadly.

You found yourself falling in love with him. He intrigued you greatly.
"How did you get that kit?" Mangle asked. You sighed, if you told him would he hate you?
"My father worked at one of the establishments... Well two of them. Until he died that is..." You looked down, talking about your father always made you upset.
"Oh. I'm sorry about that. Let me think... Worked where I was..." Mangle looked like he had a 'lightbulb' moment.
"I knew your Dad! He was the one who kept trying to put me back together and tried to tell the kids not to mangle me... He was a good man. We all liked him. Except one of the Oldies but he didn't like anyone that wasn't one of them... Sorry I should stop talking about him shouldn't I," Mangle looked at you. You were crying. You loved your Dad and when you were told he had an 'accident' at work you were too young to understand what that meant. They told you he wasn't coming home.
"When will he be home?" Child you had asked. Your mother was so upset that a family friend had to tell you, his name was Mike Schmidt or something.
"He's not coming home y/n. He's... Gone," Mike sighed. You cried for weeks and never fully got over it.

"Y/n? Y/n are you ok?" Mangle was standing right in front of you with a worried look on his face.
"Just thinking..." You mumbled. Mangle wiped the tears from your eyes and hugged you tight.
"You don't need to be upset y/n. Everything is alright," Mangle soothed. You hugged him back and wanted desperately to believe the soothing words he said.

When 6am came you were still hugging mangle.
"I'll protect you... I promise," Mangle said. You nodded and smiled slightly up at him. He kissed you, gently, kindly. You returned the kiss and found yourself feeling a lot better, lighter, as though a great weight had been lifted from your shoulders and your heart.

You couldn't wait to come back to work tomorrow.