I just noticed i havent really explained Bolts backstory. So... here it is...
(The picture was made by YeehawBabey_

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(Just as a note, Bolt's voice is basically foxy's but with a little softer tone.

Bolt: yar. I was built back in 1987. Right after the classic bite. I was rushed in production as a Spring Foxy animatronic. But my parts were mixed with Toy Bonnies spare parts, creating me by accident. so i was trashed and thrown out into the allyway
Afterward i wandered the lands for at least 3 years. Learning of how the Fazbear entertainment had been going downhill.
During my exploration of an abandoned forest, i stumbled across a portal. As i had it, i was curious.
While entering the portal, it entered me into the air, the impact cracked my endoskeleton back.

Tripple D's friend Scar noticed me. And he greeted me.
When i had explained my situation he  pulled me onto his back and took me to the castle.

Tripple D was a wee nervous to go near me, because he had read about the bites of the fazbear companies. With me resembalence to foxy, But he had patched up my back.

As i was about to go back to my dimension through another portal. They had told me that i shouldnt stay in the streets. And invited me to stay with them. Since i had no name bysides Spring Foxy, they named me Bolt! Because im as fast as a Bolt of lightning!

Since that day, i have been protecting Dreamland with my speed and agility of an animatronic. And been best friends with Scar and Tripple D ever since...

As to how i learned to play the saxophone?
While being in the allyway, i found a box containing a bunch of saxphone parts. Using some cloth that fell off my endoskeleton, i fixed up and learned how to play the saxophone!

Hope yall landlubbers enjoyed my story! Let me know if ya have any other questions