Mercury

Personality: Despite his greedy nature, he is an advocate of communism. Mercury doesn't have many friends due to his loose tongue. Neither does he get along with Pluto, and he hates malicious gossip, especially when it's about him. He is by far the least popular Stardroid, and his tendency to use Grab Buster on his allies. Pluto in particular doesn't like him because he's weak to Mercury's weapon. He's sly and cunning, rude, and wants everything to himself. Probably will smother someone if they don't do as he wants.

Appearance: His body consists of liquid metal, but his default form is a humanoid being. Mercury’s visible form is nothing but a temporary construct; his true shape is much akin to a force field. The sentient energy entraps surrounding material within itself and gives it the shape and movement of a person, creating what is called “Mercury” by onlookers. That physical body is little more than a doll; no matter how much damage it is dealt, Mercury himself remains untouched. Although it may appear to be a perfect ability, maintaining the force field in that state takes a tremendous amount of energy, leaving Mercury with little to no extraneous power, be it for attack or defense. The Stardroids’ creators considered this “simple immortality” as a flaw, and attempted to dispose of Mercury, until the development of the Grab Buster provided him with the means to attack while replenishing his energy at the same time, providing him with a practical use. That history of constant threat of disposal is what caused him to develop such a twisted personality.

Abilities: A favorite tactic of his is sending parts of his body out towards foes as large blobs. His Grab Buster can be used to steal energy from opponents. He is a particularly dangerous foe since almost anything damaging done to him is absorbed by Mercury's liquid body and reformed. Mercury can't be damaged while separated into pieces.

He is one of the first four Stardroids. He is a greedy Stardroid whose body is made of liquid metal, and is thus able to take any form and dismantle himself to attack, similar to the Devil series, and is quick at running away after causing mischief. His main weapon is the Grab Buster, an attack that can steal energy and items from enemies and absorb them to recover his health. Sometimes Mercury also uses the Grab Buster on his allies. Something in a liquid state would be fairly easy to vacuum up, particularly by a black hole. Mercury's power to melt into a liquid state is a double pun on "liquid mercury"; Mercury the planet is the closest to the Sun, which means that any metals would melt almost instantaneously when on its surface, while Mercury the element is the only metal that is liquid at room temperature. He hails from an ancient alien civilization that was constantly waging war.