Sinclair is a human male of unknown age. He has an extremely passive personality, he often avoids confrontations whenever possible. Sinclair shows a fear of uncertainty and is displayed as extremely timid. In general, he is shown to be introverted and often has difficulty with accepting the violence and insolence of the world. He often doubts himself and externally monologues his uncertainty out loud. Although he wishes to be a logical person, he is openly very emotional in some situations.