How come no one has mentioned Tsuru-Sennin? He had so much potential. Being the teacher of Tien and Chaozu, being Roshi's rival, being stated to be one of the strongest characters at the time (besides Goku, Tien and Roshi). And they do jack s*** with him but be a cheerleader on the sidelines. Not one fight, hardly any backstory, and not really much personality.