Springtrap

Springtrap is the secondary antagonist of the 1995 animated film, Five Nights at Freddy's 3, and a supporting character in the 1999 spin-off sequel, FNAF World.

He is revealed to be Spring Bonnie in the future, after being turned savage by William Afton (who eventually does the same to Freddy, Bonnie, Chica, and Foxy).

He is voiced by Tim Curry who also voiced Drake in The Pebble and the Penguin and Hexxus in FernGully: The Last Rainforest.

Personality
In Five Nights at Freddy's 3, Springtrap, unlike himself in the past (Spring Bonnie), is cruel and evil.

However, there are times when he is mourns over being a monster because he never wanted to end up like one. He is also seen shedding a tear before becoming fierce and berates Goldie when he confronts him at the end of the film, indicating that he has strong feelings of sadness rather than being furious and brutal.

In FNAF World, Springtrap is not purely evil or cruel like he is in the main story of Five Nights at Freddy's, but still maintains his scary and fierce aspects. Overall, he is social, considerate, and kind towards Freddy and his friends.

Five Nights at Freddy's 3
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FNAF World
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Trivia

 * Springtrap bares a strong resemblance to Borf from the game & animated cartoon series, Space Ace.