Nanami Tenchi is a supporting character in the anime Daa! Daa! Daa!. She is a classmate of the protagonists Miyu Kozuki and Kanata Saionji, and becomes one of Miyu's closest friends soon after Miyu transfers to the school. Nanami has short brown hair and is notably tall among her peers, with a slightly tomboyish appearance and an active, sporty nature.

Her personality is energetic and playful, but she also displays a practical and sensible side. She is not easily swept up by the romantic admiration that many other girls have for Kanata; instead, she remains level‑headed and loyal to her friends. Nanami has a very large appetite and enjoys eating, and she also has a fondness for old‑school styles of clothing. Although she is usually full of energy, she can become tired after a demanding task.

Nanami is a member of her school’s newspaper club and has a strong interest in journalism. She likes writing articles on interesting topics, and her investigative nature helps her assist Miyu and Kanata in keeping the presence of the alien baby Ruu a secret from the rest of the world. Beyond her journalistic skills, Nanami is also a capable cook, often preparing meals for her friends when they gather.

Her main role in the story is that of a supportive friend. She frequently goes shopping with Miyu and another classmate, Aya Konishi, and she willingly helps care for Ruu whenever needed. Nanami’s kindness and willingness to help make her a reliable presence within the group. She does not undergo significant personal transformation over the course of the series; instead, she remains a steady, upbeat friend who brings warmth and practicality to the everyday lives of the main characters.