Nappa

Nappa (ナッパ) is an elite Saiyan warrior from Planet Vegeta, and Vegeta's partner in combat. Prior to the destruction of Planet Vegeta, Nappa was the General of the Saiyan Army under the planet trade organization and aid/partner to the young Prince Vegeta as well. After his race's demise, he along with Vegeta and Raditz work as soldiers directly under Frieza, which leads him to Earth. His name is a pun off of Chinese cabbage.
Though his genes give him the appearance of someone in their mid-30s, Nappa is approximately 50 years old, and is first seen with the Saiyan Prince Vegeta after hearing of Raditz' death at the hands of Piccolo and Goku. At this time, he looks identical all the way to the time of his death. He has hair in the Bardock special (although it seems to be a smaller patch, lacking sideburns of any kind). He travels to Earth with Vegeta to gather the Dragon Balls, to wish for eternal life. He is the second most powerful Saiyan warrior in Frieza's army and reports his accomplishments to Frieza directly, alongside Raditz and Vegeta. Like most Saiyans, Nappa wears a scouter to detect the ki of his enemies.
Nappa has quite a destructive personality and loves demolition to an extreme level. When arriving on Earth, the first thing he asks Vegeta if he can destroy a town. When taking time off to wait for Goku (in the anime only), Vegeta allows him to destroy as many things and places as he wants, as long as he does not waste enough energy to break a sweat. Nappa proceeds to demolish an entire Navy fleet division as well as an aerial raid, smashing through many jets and helicopters before leveling a slew of ships. Despite this, however, he usually congratulates his victims when they utilize attacks that come close to killing him, as evidenced when he congratulated Tien on his use on a Tri-Beam before dying that shattered his armor, citing that, had his aim been better, it would have severely injured him.
Nappa also has a very cocky personality, as he enjoys toying with his opponents. This shows his dark humorous side as he sometimes tells himself crude jokes when he's alone and laughs at them. He tends to fight first and makes use of his brawn more so than his brain. However, his great ego would immediately vanish the second someone causes him a bruise or scar, and would decide to kill them slowly and painfully as a result. He is, in this instance, vain to the extent that he feels his appearance should remain unscathed. However, he would still eliminate anyone as quickly as possible when losing patience with them. Oftentimes, he allows his anger to get the best of him, becoming extremely enraged and infuriated, which results in Vegeta constantly reminding or, in some cases, ordering him to calm down.
An anime-only flashback in the Frieza Saga, however, shows a more sympathetic side to Nappa. Shortly after conquering the Planet Shikk, he, Vegeta and Raditz are met with insult rather than rewards for their fast work. Nappa is openly hurt and angered that he just destroyed an entire race of innocent people for no reason, and later states to Vegeta that he hates his current life of ending lives for Frieza, also demanding to know how Vegeta can continue to obey Frieza after all the crimes the warlord has committed. He also appears to be shocked when Vegeta claims not to care about the death of his father and the rest of the Saiyan race.