Suguru is a tall, slim, and muscular man with long black hair partially tied up in a man bun while the rest drapes down his back. He has thin black eyes. His earlobes are large and gauged. Following Rika’s death, Suguru suffered from clinical depression— something he occasionally relapses into. Suguru is withdrawn and polite compared to Satoru, his best friend. Suguru has an overprotective and nurturing personality. He is intelligent and methodical, though he can be immensely manipulative.