R's

Raditsu
Race: Saiya-Jin
Series: DBZ
Sagas: Saiya-Jin
Goku’s brother, Raditsu, has nothing in common with Goku. Raditsu comes to Earth to see if Goku has taken it over yet. When he sees Goku has not accomplished his mission, he takes Gohan. Goku and Piccolo pursue Raditsu. Raditsu is killed, along with Goku, by Piccolo’s Makankosappo.

Rikum
Race: Unknown
Series: DBZ
Saga: Freeza
Probably the dumbest member of the Ginyu Force, Rikum makes up for his stupidity with his fighting. He is very muscular, and second biggest only to Baata. Rikum is the first victim of Goku on Namek.

Rou Kaioshin
Race: Kaioshin
Series: DBZ, DBGT
Sagas: Buu, Shenlon
An even higher rank than Kaio, Rou Kaioshin would have the main title as Rou Kaioshin, but he was sealed in the Z Sword. After being sealed for many years, Gohan released him. Rou Kaioshin then gives Gohan some of his power to make Gohan stronger. When Goku is stuck in the afterlife when Majin Buu is wreaking havoc, Rou Kaioshin gives his life to bring Goku back.