Nappa Character Facts

Though his genes give him the appearance of someone in their mid-30s, Nappa is 50 years old, Nappa has quite a destructive personality and loves demolition to an extreme level. When arriving on Earth, the first thing he asks Vegeta is if he can destroy a town. When taking time off to wait for Goku, 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 Spirit Tri-Beam that shattered his Battle 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 to himself. 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 (though in the Japanese version, his rage against Krillin is fuelled by the blow to his pride over being wounded by a much weaker opponent). 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. Whenever Vegeta tells off Nappa for acting asinine, or not listening, Nappa apologizes to Vegeta, usually in a slightly fearful state, and then proceeds to claim he was not thinking straight, showing his respect for Vegeta.