Master Roshi from Universe 13. His history is very different from his other counterparts, as Gokū never became his student.
Universe 13 Origins - The Friend
In Year 451, Kakarotto transforms into a Great Ape, and begins destroying many villages and killing numerous Humans. Master Roshi and Krillin begin to investigate the destruction and murders. Roshi tells him to go to search for survivors, and warns Krillin that this is no mere beast, that it is a trained killer. While Roshi investigates, Krillin later returns to Roshi with Kakarotto. Kakarotto and Krillin then see Roshi, Krillin tells Roshi that he has found a survivor. Kakarotto curiously tells Roshi that he looks a lot like a Human. Roshi replies that he is human, then Kakarotto, enraged, attacks Roshi. As they begin to fight, Roshi states that Kakarotto's power is enormous despite his young age. Roshi realizes that Kakarotto, is the beast that attacked the villages. Krillin attempts to grabs Kakarotto, begging him to stop, however, Kakarotto pushes Krillin off of him in disgust. As they fight, Roshi defeats Kakarotto. Realizing that he is the beast, he says that he will attempt to help the poor boy, and give him peace, taking pity on the poor boy. As Kakarotto regains consciousness, he runs into a cave, Roshi runs into the cave, despite being fully aware that it is a trap. Kakarotto and Roshi fight, and Kakarotto, after a short battle, is the victor. Kakarotto then says to Krillin, that he must kill all Humans, and one day, he will kill him as well. Krillin, mourning the death of his master, vows to kill Kakarotto one day.