Natsuo is one of the three hidden non-playable characters that were first introduced in Pop'n Music 2 AC. Her artwork can be found in the Pop'n Museum on the Pop'n Music 1-4 Peace page.
Natsuo appears as a young girl with black eyes, short, light brown hair, and peach skin. She wears white blouse with a red tie, blue coat, and a matching blue, tattered skirt. Her shoes are plain brown.
- The Pop'n Museum page states Natsuo was drawn during the Pop'n Music 2 era. It also hints that she may have been planned for the CS release of Pop'n Music 3.
- She appears in the arcade versions of Pop'n Music 2 and Pop'n Music 3 when you activate the RANDOM option of the game, by holding both white buttons and then pressing the red button at the title screen.