Saiyan-Goku and Vegeta are the last two remaining living Saiyans. Freeza destroyed their home planet, Planet Vegeta, along with almost all of the Saiyans.

Humans- People who are from Earth.

Namekian(Namek-sejin)-From the planet Namek, are able to create Dragonballs. Namek is destroyed by Freeza, but a new Namek is created with the Dragonballs.

Changlings-All entities that are able to change shape(i.e. Freeza, Cooler)

Androids-Created by Dr. Gero to kill Goku, their ki cannot be sensed, so they are very sneaky.