Ratthew appears as a small black anthropomorphic rat. He has a white snout, 2 white buckteeth, and a long, curled pink tail. His ears resemble more like rabbit ears than typical rat ears. Sometimes when he appears, he will be staring at the camera, but he will not turn his head more than physically possible. This does not mean he is an anomaly. Ratthew comes off as paranoid but kind-hearted. He seemingly has a lot of distrust that stems from experience. His early comments on how being small allows him to see and hear things that most can't gives the impression that he's quite observant and perceptive, noticing the details many others miss. Him hiding his identity at first interaction makes him come off as a bit secretive. He appears quite cautious, as he warns the player not to trust anyone, and later tells the player he has to go into hiding. Despite his size, he is a grown adult. Possibly in his 20s or 30s. He is shown to be quite responsible when he wants to be. Often teasing as well. He is a mixture of emotions. He has a strong liking for cheese.