Officially handsome according to the author, he is extremely taciturn. His jet-black hair is layered and spiky, short at the top like a bob but long at the bottom, reaching below his shoulders. He has dark blue eyes. They are dull, so-called 'dead eyes,' and his sharp gaze often gives off an intimidating atmosphere. In the past, his eyes had highlights and were not as sharp, giving off a gentle and soft impression with drooping corners, but it is presumed they gradually changed to their current state after Sabito's death. Uniquely, his haori pattern is split down the middle. One half is a memento of his older sister, Tsutako Tomioka, and the other half belonged to Sabito. He is quite tall. At 176cm, he is in the middle rank among the Hashira, but considering the average height of an adult male in modern Japan is about 171cm, he is on the taller side. Given that the story is set in the Taisho era, he is exceptionally tall. On the surface, he seems mentally strong and cool, but he is surprisingly clumsy. This is because he lacks social awareness. He doesn't consider the other person's feelings at all and unintentionally says hurtful things. For example, by overly summarizing self-deprecating thoughts like "I (who only survived by chance) am different from you all (who rightfully killed demons and passed the Final Selection)," he ends up causing misunderstandings. According to the author, he hates dogs because he was bitten on the butt by one as a child. Uniquely, he eats with grains of rice stuck all around his mouth. It seems to be just a habit. In a side story, while eating at a restaurant with Shinobu, when salmon with daikon is served, he smiles so broadly that everyone around him is shocked, showing how much he loves it. Shinobu, who was next to him, was so horrified she asked him not to eat while looking in her direction. The only Hashira who truly dislike Giyu are Sanemi and Obanai. The others either have no interest (Muichiro, Tengen) or have a normal relationship (Kyojuro, Gyomei, Mitsuri). Only Shinobu tends to give him bitter advice, knowing he is misunderstood and lacks the words to explain himself.