Sai has black eyes and short, black hair, and he possesses a very pale complexion. He is usually seen carrying a small backpack with his brush, scrolls and ninja ink in it.
Sai's typical attire consists of a short black jacket with red straps, a high-collared midriff shirt, black pants, shinobi sandals and gloves with his index and thumb fingers exposed.
Sai, who has suppressed his emotions in the past, is usually seen with no distinct expression on his face. He calmly views his surroundings and does not react palpably to anything in particular. Tenten has described him with having an "amazing poker face".
Due to his lack of social experience, Sai is often left in awkward conversations. He is unmindful of his own remarks and their effects to others, even though he might have been offensive. He has an inability to discern between a rude statement and an honest statement, which is indicated when he casually insults Lee's thick eyebrows.
Due to fact that Sai is amongst the most powerful in the Konoha ANBU organization ROOT it is expected that he posses great skill in ninjutsu as well as taijutsu.