Thirst Level: 5

The old man thirst is very apparent with Master Roshi. Although the DBZ video game series doesn't play around with Roshi's perverted persona as much as the TV series, it still appears every once and awhile. One memorable moment is in Dragon Ball Z: The Legacy of Goku, where Goku happens to discover what is assumed to be one of Roshi's dirty magazines. Although Roshi can still get in the ring, maybe the bed is the only place that can actually kill him. He is 430 years-old, after all.