Planet FM

Planet FM is a fictional planet from the MegaMan Star Force series. It is home to the FM life forms, or FM-ians, a race of aliens who have EM bodies who usually bear names of constellations and feed on human negative emotions. They are the main villains in the 1st installment, having destroyed the similar Planet AM and planning to destroy planet Earth due to their King's paranoa, although some of them are not evil and by the end their King decides to stop his actions and make up for his crimes. Their king is called Cepheus.

List of FM-ians:
Cygnus is an FM-ian who favors grace. He takes the form of a blue swan as he's named after Cygnus the Swan. He takes advantage of Aaron Boreal's assistant Tom Dubius's paranoia to take him over to become Cygnus Wing. In the third game, he becomes Mr. Dubius' Wizard.

Taurus (Ox in Japan) is on of the FM-ian life forms that appear on Earth. He is named after the constellation Taurus the Bull, or Ox, and is shaped after a fire ox. He is said to favor size and brute force, and due to this Wave Changes with Geo's rather strong friend Bud Bison to become Taurus Fire (Ox Fire in Japanese). Early in the third game, he becomes Bud's Wizard.

Lyra (Harp in Japan and the first English game) is a female FM-ian who usually gives Omega-Xis a hard time in conversations due to her being very feminine. She's named after the constellation Lyra the Lyre (or Harp) and thus takes on the form of a lyre. She uses young singer Sonia Strumm's (Sonia Sky in the anime) loneliness and misery to Wave Change with her to become Harp Note (LyraNote in the English anime dub). Oddly, she chooses to stick with Sonia rather than abandon her like the rest of the FM-ians do.

Libra is an FM-ian who balances fire and water on his two scales for arms. He gets his name and appearance from the constellation Libra the Scales. In order to Wave Change, he takes over the body of Geo's teacher Mitch Shepar and becomes Libra Scales (Libra Balance).

Ophiuca (Japanese: Ophiucus) is an FM-ian named after the constellation Ophiucus the Serpent Holder. Her serpentine-like appearance doesn't become very pronounced until she takes over Luna Platz's body and becomes Queen Ophiuca (Ophiucus Queen).

Gemini  is named after Gemini the Twins, and has two heads in accordance with this. He forms an alliance with Geo's classmate Patrick Sprigs and becomes Gemini Spark, an entity of two beings: Gemini Spark White and Gemini Spark Black, White being controlled by Pat and Black by Rey.

Cancer is the crab FM-ian, named after Cancer the Crab. He Wave Changes with the 3rd grader Claud Pincer and becomes Cancer Bubble. He is mainly the small and harmless guy of the group.

Wolf, named after Lupus the Wolf, is the werewolf FM-ian who merges with the gardener Damian Wolfe and becomes the savage Wolf Woods (Wolf Forest). He glows orange and goes crazy when he sees a full moon.

Crown is themed after two constellations, Corona Australis the Southern Crown and Corona Borealis the Northern Crown, and as a result wears a crown the size of his original body. He merges with the skull and ghost of deceased French king Jean Couronne XIV and becomes Crown Thunder.

Goat Foo is a Goat FM-ian named after Capricornus the Goat. He meets with the boy Kidd Gruff and partners with him to become Kung-Foo Kid (Goat Kung-Fu)

Virgo is an FM-ian named after Virgo the Virgin. She appears in MegaMan Star Force 3. Her partner, Queentia, transform the two to Queen Virgo. She is a criminal that escapes to Earth and almost tries to break Ace and Queen Tia apart.

Corvus is an FM-ian named after Corvus the Crow/Raven. He appears MegaMan Star Force 3. He has a relationship with Omega-Xis as they used to engage in duels back on Planet FM.

King Cepheus is the FM King, the ruler of Planet FM. He is shown to be very paranoid and is easily manipulated by Gemini because of this. He is named after the constellation Cepheus, a constellation of a mythological king, thus he's themed after a king.

Andromeda is an FM-ian planet destroyer. It destroyed Planet AM and is the final boss of the first installment of the series, as it attempts to destroy Earth. It has a ball of loneliness at its center and it devours other EM beings. It's named after Andromeda, a constellation of a mythological princess, although its gender is never revealed, as everyone refers to Andromeda simply by "it". However, it's more likely named after the Andromeda Galaxy than the constellation, as it is themed after a space planet-eating monster, which transforms into a space-themed robot. Whether it's originally an FM-ian or it was built by the FM-ians, its origin remains unknown, although it seems to have a legendary reputation among the FM-ians. However its true form may be a princess, princess of the galaxy.