Harp (ハープ?), also known as Lyra in the English dub of the anime, is an EM Being from Planet FM. She has the power to EM Wave Change with Sonia Strumm to become Harp Note. Harp is not only Sonia's partner in combat, but also helps Sonia write songs, and sometimes plays the role of a parental figure for Sonia.
Harp tends to make flirtatious comments towards Omega-Xis after they become allies, which generally annoys Omega-Xis. Whether this is out of a genuine attraction or just another way to bother him is debatable.
Harp is first encountered in MegaMan Star Force after the player defeats Cygnus Wing. She convinces Sonia Strumm to let her into her body, after Sonia's manager tries to force her to sing. After Mega Man defeats Harp Note, their merged form, Sonia forms a Brother Band with Geo and Harp abandons the FM-ians and stays with Sonia. She is shown to be arguing with Omega-Xis after he obtains the Andromeda Key, later taken from him by Taurus Fire.
Her last appearance in this game is one where she is seen on top of Geo's house, talking with Omega-Xis. With Andromeda defeated, she decides to stick around on Earth.
Harp and Sonia are given a much lesser role in the plot of MegaMan Star Force 3. They are still partners, both in fighting and in music, but are not seen as often nor play as large of a role as they used to. Sonia and Harp help defend the National WAZA Headquarters during the Dealers' attack, aiding them in holding off until Geo and Omega-Xis arrive.
- Harp is named after the constellation Lyra. It was one of the first 48 constellations listed by the first-century astronomer Ptolemy, and is one of the 88 officially-recognized constellations in modern times.
- Though it is a small constellation, the principal star comprising it is Vega, which is one of the brightest in the sky. It is also bordered by the dragon Draco, the Greek hero Hercules, the little fox Vulpecula and Cygnus the swan.
- Harp is one of the few EM Beings whose name is not part of their EM Wave Change in the English games.
- Harp is the only unavailable Noise Change, because her type is non-elemental, and such places have been occupied by Cygnus and Libra Noise. Though concept art of Harp Noise still exists and can be seen in the MegaMan Star Force Official Complete Works.