No spoilers

Logan. Thomas's Logical side. However, he always gets ignored, shunned and flat out not listened to. Except he does have one person to talk to. Remus. However unlikely they have been best friends since the beginning. Remus would ramble on about god knows what and Logan would always apply his logic. Sometimes when they were simply bored they would murder each other. It always helped stress. But when Remus gets heartbroken by Deceit he comes to realise how much Logan truly means to him.