Learn about the Shinigami, Duo Maxwell!
Where I got all this info from is already credited with a link put next to it.

Name: Duo Maxwell (real name unknown) Codename: Shinigami (God of Death) Age: 15 (at beggining of GW) 16 (in Endless Waltz) Sex: Male Nationality: American Gundam: Deathcythe Deathscythe Hell Deathscythe Hell Custom Relatives: None Height: 156 cm (5.1) Weight: 43 kg Hair Color: Brown Eye Color: Cobalt Blue Braid Lenth: 32.5 inches (Thanks to The House of Duo Maxwell) Place of Birth: Belived to be near L2 Colony Personality: Mostly always cheerful, the funny-guy of the group, the one who always cheers people up, talkative like hell! Use extreme caution! He's an expert in theft. Abilities: Great combat skills

This next part copied from The Gundam Project.
The pilot of the Gundam Deathscythe, Duo is as jolly and happy-go-lucky as Gundam pilots get. He persists in offering his friendship to the initially hostile Heero, eventually winning his antisocial comrade's trust through sheer persistence. But despite his friendly nature, Duo earns his "God of Death" nickname when he takes on Alliance OZ and soldiers in battle.
Prior to Operation Meteor, Duo was part of the spacegoing salvage organization known as the Sweeper Group, and on Earth he is assisted by the Sweepers' seafaring kinsfolk. When there is a lull in the fighting, Duo happily returns to his salvage-merchant's trade. He is distinguished by his black wardrobe, his yard-long braided ponytail, and his minister's collar.