Springtrap

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"'Okay fine. here's your cake. Get out of my sight.' -Springtrap to Mangle" "'I'm no longer an Animatronic, I'm a Hybrid. I almost look like a type of Monster, but as long as I'm here, I've always got your back.' -Springtrap to Fredbear"Springtrap is a Spring Animatronic who worked along with Fredbear in Fredbear's Family Diner, He was the one who fixed Mangle at the very beginning, resulting her due to fall for him. He is the main Protagonist of this series. 

Behavior
He is portrayed differently, he has 2 personality types, the first one is his normal Spring Bonnie self and the other one when he is in control by William Afton, instead of being evil. He has a conflicting relationship with Mangle, with Mangle thinking that they are lovers but he begs to differ since he seemed irritated at them. though he admits that Mangle was another good friend of him, maybe the second best next to Fredbear. he was different in his Spring Bonnie state, being designed as a female animatronic, cheerful and jolly like Mangle. in his current state he is rather grumpy and gloomy. his gender was also changed though he stated that he wanted to be a male animatronic ever since he was Spring Bonnie. He cares about his best friend Fredbear. Tired of his deteriorating state, he plans to destroy himself in order for William's soul not to return again. but the animatronics with the exception of the Puppet were against the idea.

Fredbear's Family Diner Career
His behaviour back in Fredbear's was different. His voice was feminine, cheerful, energetic, and joyful. He's a great partner and also best friend of Fredbear. he also witnessed the bite that his friend did and claims that it was not Fredbear's fault. When Fredbear's was demolished, he was moved into the new building known as Freddy Fazbears' Pizza (vandalized as Freddy Fazfuck's), in the Safe Room, while his friend was moved into a basement in the same building.

Trivia

 * this might be the only Five Nights at Freddy's series where Springtrap was a central protagonist.
 * William Afton's head still remains in him with the visible skull, he plans to destroy himself in order to vanish William's dormant soul in case if he might return, but Mangle, Fredbear and the other Animatronics didn't like the idea, thinking that there will be a way to get rid without destroying Spring Bonnie
 * he locks himself in the basement every midnight in order not to harm anyone due to William controlling him at that time.