Udo is a large fighter with blond hair and a blond mustache. He wears reddish-black tights and combat boots. He also has a very muscular build, being very tall and in possession of a massively well defined physique. Udo resembles someone of American descent, even wearing western clothes. His appearance mainly counters that of Gohan; while Gohan is small, pale, and of eastern descent, Udo is giant, burly, mustachioed and of western descent.
Udo participates in the Intergalactic Tournament. He proves to be a great fighter by Earth's standards, having made it to the one-on-one preliminaries despite the many combatants. He faces off against Gohan during the preliminaries on the high platforms over the ocean. Udo seems a little proud of his luck, yet conflicted about his circumstances of fighting a small kid. He tells Gohan that he will not be going easy on him, referring to him as a "baby". He is both surprised and respectful with Gohan's answer, telling him he has a lot of guts, before their match begins. He put up little struggle against the young Saiyan in his base form, but loses in the end.
- Udo is most likely based on the American pro wrestler Stan "The Lariat" Hansen who achieved his greatest success in Japan. Udo even appears wearing Hansen's signature cowboy hat in the pre-fight graphic. Udo also looks similar to a wrestler who appears with Arale Norimaki on the cover of the Dr. Slump chapter "The Great Arale-Eye Caper: Part 2" and who is most likely based on Stan Hansen as well; this wrestler is also shown among the Penguin Village residents in "Penguin Gran Prix".