From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Colonel Yellow (イエロー 大佐, Ierō Taisa; FUNimation "Captain Yellow", Viz "Colonel Yellow") is a member of the Red Ribbon Army.
Yellow was an operative who was tasked with finding the Dragon Balls for General Kappa. He had an Australian accent and appeared in the form of a humanoid Tiger. He became flustered when talking to superiors to the point where it was almost as if he actually feared them. Unlike most of the officers, he had a sense of humor, but felt superior to the likes of Bora, a native from the Sacred Land of Karin. Strangely, despite having a short temper, Yellow was also persistent in getting people to cooperate with him and actually seemed to care about his troops – something rarely exhibited by Red Ribbon Army officials. After he terrorized a village located in the Sacred Land of Karin with a group of his troops, Son Goku punched him out of his plane while in midair, killing him.
Dragon Ball GT
Yellow later appeared for a short time during the Super 17 Saga only to be easily killed again by Son Pan. He made another short appearance later as he stood in line behind Puipui in front of Great King Yama's desk as he waited to be sent back to Hell.
Yellow appeared in Dragon Ball Z: Sūpā Gokū Den: Totsugeki Hen.