Michael Afton's #1 Hater.

Though Kasya was hospitalized by the bite, what really killed him was William's attempt to revive the boy by putting him "back together" (see: placing Fredbear's head on him and setting it off. It made sense at the time.) Of course he died instantly.

He may still have been able to rest if his grave wasn't disturbed afterwards. Oh well.

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

The one you really should not have killed.

His unique devilish appearance is on his own behalf, as Kasya considers himself to be one. He also 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.