Sai has a muscular build, although he is slightly scrawnier than most. His mid-length dark hair is messy, slightly wavy, and frizzy, pushed to the right side, away from his left eye. Almond-shaped eyes with visible lashes on the outer corners and mostly even eyebrows with feathering at the top complete his facial features. Notably, Sai bears a jagged petrification scar on his hands and forearms. He holds dual Indian/Japanese nationality.