Tamao is a shy girl who is in love with Yoh Asakura, even though she knows that Yoh is engaged to Anna Kyōyama. She is 10 years old at the start of the series. Her birthday is on June 17, 1988 and her blood type is A. Initially, she is so shy that she uses her sketchbook and points to pictures in order to tell people what she wants to say. Orphaned at a young age, she was brought to the Asakura family by Yoh's father, Mikihisa Asakura and trained as an ascetic monk. In recent KanZenBan, it was revealed that Tamao attended Shinra High right after Yoh and the others went to America.
Tamao's specialty is her use of a kokkuri board, which is similar to a Ouija board, in order to perform divinations. She is also an ascetic, like Mikihisa; her spirits are Konchi, a kitsune, and Ponchi, a tanuki, in the same way Mikihisa has a kitsune and a tanuki. Tamao is named for Tamao Nakamura.