Cepheus

Cepheus is king of the FM-ians. However, in his life, he had been extremely paranoid due to other FM-ians attempting to kill him in order to ascend to the throne. Gemini then made use of the paranoia to get him to use Andromeda to destroy Planet AM. When Planet FM received signals from Earth offering to form a BrotherBand, he interpreted it as an attempt to wage war on Planet FM, and so he started the assault on Earth which takes place over the course of Megaman Star Force 1. At the end of the game, though, Andromeda got deleted by MegaMan (Geo Stelar and Omega-Xis). Cepheus realized the mistake he made, and decided to trust in Geo and Earth. Now Cepheus, with the 3 last AM-ians (Dragon Sky, Leo Kingdom, and Pegasus Magic) are trying to rebuilt the AM planet.

Cepheus does not appear at all in Megaman Star Force 2, but he gets mentioned in Megaman Star Force 3 when Geo encounters the AM sages in the secret area of that game.

In the anime, Cepheus instead openly accepts the BrotherBand signals near the climax of the season and orders the FM-ians to stop the attack and return home, apologizing for the trouble caused. As Gemini Spark White attempts to use Andromeda to destroy the Earth in the last episode, Cepheus destroys Gemini, and wipes Patrick's memory of everything that happened while he was with Gemini. Also, Cepheus allows for Geo to speak with his father, who has been converted to EM waves by Omega-Xis.