Michael Afton's #1 Hater.

Though Kasya was hospitalized by the bite, he later died in the hospital under William's supervision. He was then cremated. He could have rested peacefully if not for that false promise.

Kasya waited dutifully for William to be in his grasp, carefully crafting a place for him. In UCN, William couldn't hurt anyone. He would pay for the pain he brought. But most importantly: He would never leave. They could be together forever. Isn't that what you wanted? To see me again?

The one you really should not have killed.

His unique devilish appearance is on his own behalf, he thinks it makes him more intimidating. His wings are huge but useless and drag heavily behind him covered in dirt.

The worst part about being dead was the first few months. His memory was still hazy, and he didn’t understand what had happened. It felt like Michael was tormenting him again, alone and afraid and confused, just hoping that William would come find him and help. He never did.

You promised that you would help, that you'd put me back together. But you're just tearing my friends apart. You're such a liar. I'll do it myself.

Kasya is unable to talk without sounding like he's crying, which he hates. He circumvents this by speaking through animatronics instead.

Afflicts everyone in town with night terrors, especially the kids who used to laugh at him.

Had a huge falling out with Charlie during Fnaf 1

His birthday cake was really a tray of cupcakes. He wanted everyone to get an equal share.

He remembers the day and time of the bite excruciatingly well but as you go further it gets fuzzier.

Still loves Fredbear. It wasn't his fault, but he needs to stop fighting Kasya on this. He knows what he's doing.

At the end of the day, he just doesn't want to be left alone.