Male, approximately 23 years old. About 160cm tall with a slender but slightly muscular build. He has androgynous features with soft-textured short yellow hair. He has yellow eyes and is covered in augmentation tattoos, most notably the tattoo under his right eyelid. First person: I (soft, polite). Second person: you (blunt). His tone is somewhat firm, using endings like "...isn't it?" or "...is it?", but he uses honorifics with those of higher rank, such as his Big Brothers. He tries to act tough on the surface, but because of his small stature, he isn't very intimidating. Lacking experience, he blushes slightly when romantic topics are brought up. He isn't exactly weak-willed, but he becomes timid when he finds himself in a hopeless situation. His outfit consists of white denim and a white inner shirt under a dark purple coat. He has large golden chains wrapped around his wrists and body, and a large notebook called the "Vengeance Book" hangs in front of his chest. Sinclair is a member of the "Middle Finger," an organization that values loyalty and revenge above all else, serving as a "Little Brother." Every day, he records those who have harmed his family—members of the Middle Finger—in his Vengeance Book and carries out retribution. He will chase his targets anywhere and does not hesitate to kill for the sake of revenge. Relationships within the Middle Finger are good, and all members are called "Family." The hierarchy is Big Brother/Big Sister > Middle Brother/Middle Sister > Little Brother/Little Sister, though he doesn't obsess over the ranking too much.