Sonic suffers from Depression and is some what of Yandere, he had killed tons of people for just looking at his friend Tails.

Shadow is known as the blind killer, since he was kind of blind, because of this he had a hard time seeing who was the bad guy and who was the good guy, he was also crazy in away that wasn't normal, since G.U.N didn't what to deal with this they just gave him up to the Asylum.

The Doctor shoved Sonic into the cell with Shadow, "You little Shit, this is for bitting the Doctor!"

Sonic rolled his eyes and looked over at his new roommate, "Hey I'm Sonic....and You are?"

Shadow huffs and and turns his back to Sonic so that he was facing the wall.