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Chiaotzu
Chiaotzu is a short little whit clown that is the close companion of Tien. He had a first appearence in the Dragonball series and was a student of Tsuru-sennin. He has the ability to float in midair and can fight almost as well as Krillin. Chiaotzu is killed in the battle against Nappa and Vegeta, but is revived with the dragonballs after taking training with King Kai.
Cooler
Cooler is the main villian of three Dragonball Z movies. Cooler is the son of King Cold and Frieza's brother. He fist sits in his spacepod and witnesses Frieza's destruction of planet Vegeta, and also sees Goku's spacepod in course for Earth, thinking it was part of Frieza's plan. Yearls later, Cooler came to Earth and found that Goku had not completed his mission as a Saiyan and even worse, Cooler found that Goku had killed Frieza. Cooler battles the Z Fighters only to end through being shot into the sun by Goku. Later, Cooler returns for revenge after being resurrected by the Big Gheti Star that held his DNA, but is killed after having absorbed too much energy from Goku and Vegeta and blew himself up.