Sigma is quite an old tokota, although he acts more like a young pup. Sigma is generally kind, honest and sincere, and he feels guilty when he does do something wrong, such as stealing food, or not following commands. Sigma is rather positive in most cases, almost trusting everyone by default. He's easily swayed by his emotions, Because of this, Sigma can seem weak-willed and a fool who is easily taken advantage of. He has a stellar memory, able to remember people he may have only seen once with his handler, and remember places he's been. He also has a rather strange obsession with cats, often even attempting to imitate meowing.