Shin's mask is shaped like a human heart, although he usually wears it backwards with the front of it facing backwards and two eye holes cut out of the back. Without a mask he is blond with blue eyes, and wears glasses. He is usually in a suit with an un-tucked white shirt and sneakers. His tool of choice is a hammer, as well as his magic smoke that allows him to dismember and dissect people without them physically dying.
Despite being a hitman Shin believes in fair fighting and refuses to use his magic abillity's on people who cannot use magic, resorting to his hammer instead.
In contradiction to Shin's controled and content nature he is very blood thirsty for competition. as shown in the first chapter, he gets thrilled when En assigns him and Noi with the task of killing Kaiman and Nakaido.