Origin Sonic

Origin Sonic, later known as Golden Sonic, is the secondary antagonist of Five Nights at Sonic's: Back From The Past, appearing as the main antagonist of Act 0 and a major antagonist in the following acts.

Appearance
He is a lighthearted little hedgehog who has many changes from the real Sonic like his fur color, voice, gloves, shoes and height.

In Act 1, his eyes becomes red with light red pupils and the cloning material was starting to leak from his eyes. His shoes also became blue.

In Act 2, his eyes becomes black with while pupils and the cloning material was clearly melting out of his eye sockets, he also had visible blood on his teeth, showing the bite he caused to Eggman 26 years ago.

In Act 3, he is the same,but his body is covered more in cloning material and starting to melt.

In Act 4, more of his body was covered in cloning material, almost covering him entirely.

History
He is the first clone of Classic Sonic to be made. After the daytime, when the Dr. Robotnik comes in for the night, Origin thinks that he is a robber and tries to kill him. After Robotnik's five nights on the job, Origin Sonic gets into a fight with him, bites his head and goes into a depression. Slowly, the cloning technology that was used to make Origin Sonic fades into some kind of ink with him going insane.

In 2015, his cloning material was starting to melt and his appearance became more insane. He would torment Knuckles during his night shift by randomly appearing on a poster and then in his office as an attempt to murder him.

In 2017, his appearance became worse, the cloning material was coming out of his eyes. He killed Amy Rose after her night shift, declaring that he had enough of her survival.

In 2023, his entire body started to melt and the cloning material was covering more of his body. He attempted to kill Modern Sonic by appearing either in his office or on the cameras, but failed. However, Modern Sonic was then killed by Kelly after finishing his night shift, which indirectly succeeded his goal.

Around 2028, his body almost covered his entire body and was now even more insane than before. He tried to kill Luigi inside the abandonned Sonic's Hero Pizza Palace from the first game, but failed again. Fortunately for him, Kelly arrived, trying to kill Luigi.

The cloning material eventually took over his entire body, turning into Shadow Sonic, who would go around every timeline to gather the Golden Sonics form their respective time.