Name: Captain Cosmo Satan
Age: 23,006

Appearance: Imagine a star with the bottom two points lopped off and replaced with a muscular humanoid body and you have the general body shape, with the two outward points being his shoulders and the top being his "head." His skin is blue and strangely rubbery in appearance. Four large purple eyes are on what would be his chest, two on each side, and instead of a belly he has a large closed maw, big white teeth jutting out of it. He has no toes, his feet resembling boots with the toes curling upward like hooks. His fingernails and long and painted bright red. He has a "cape" hanging off his wide shoulders that falls just above his ankles. The only things that don't seem to be organic and a part of his body are the numerous golden bejeweled rings, bangles, bracelets, and chains adorning his fingers, arms, and legs.

Personality: A boisterous and greedy alien always on the lookout for adventure, and good time, and as much gold as he could get his hands on. The events leading up to his death, however, have greatly influenced his outlook on material wealth.

Powers or Abilities: A great alchemist, able to brew as many type of potion as there are stars in the sky. The mouth in his stomach is actually his cauldron fused to his body, and tapping into its energy allows him to freely transmute his own body, create not only useful items but homunculus monsters, and generate energy that he can attack with. 

Equipment and Weapons: A pair of bejeweled cutlasses are his most common weapons.

Universe of origin, and perhaps a description: A universe of countless galaxies, circling a great alchemical cauldron known as the Galactic Cauldron from which all was born in the age of the gods. Every civilized planet uses alchemy to some degree except small backwaters like Earth that don't know anything. It was on these worlds that the keys to the Galactic Cauldron were hidden long ago, guarded by secret sects of galactic alchemists.

Bio (leading up to death): Satan was one of these guardians, a young but genius alchemist, until he was seduced by the glitter of gold and broke the tenant of alchemical law forbidding the creation of material wealth. A great and terrible conflict ensued between him and his fellow alchemists, but they were overrun by Satans hordes of monsters. Satan took possession of the key and escaped to the stars to seek the rest and take the Galactic Cauldron for his own. Over the course of his long journey he gathered allies to his cause, eventually forming the Devil Cosmos space pirates whose raids spread terror across the universe.

It was at the height of their power that the pirates came to Earth to seek the final key, but they were held up. One of the alchemists of Satan's planet had made his way to Earth, created weapons and defenses, and armed five teenagers to stand against his might. He eventually laid his hands upon the key he'd been seeking, but it had taken the sacrifice of all the members of his crew. 

Cause of death: In his grief Satan made his way to the Galactic Cauldron, his enemies in hot pursuit, resolving to turn the entire universe to gold in their honor. The teenagers caught up and, after a long and frightful battle, plunged Satan into the depths of the boiling cauldron. He was transformed into a golden statue, then disintegrated and scattered throughout the universe.