Nagisa is a cute pale-skinned girl with short, wavy brown hair that reaches a little below her shoulders, big and downward-slanting amber eyes and she has a frail physique as noted by Tomoya Okazaki, therefore she is petite for her age, due to her poor health and weak immune system.

She also has two prominent ahoge sticking out on top of her head. The two ahoges resemble the letter 'M', and she inherited that physical trait from both of her parents (Akio Furukawa and Sanae Furukawa).

