Bacterian

Bacterian enters the 21st World Martial Arts Tournament relying on one of the most unconventional fighting strategies in Dragon Ball history: hygiene so poor that it functions as a biological weapon. His body odor is potent enough to stun opponents from a distance, and his various attacks involve weaponizing his own filth in creative and disgusting ways.

He faces Krillin in the preliminary rounds and initially dominates the match. Krillin, who has a nose, is overwhelmed by the stench and cannot fight effectively. The turning point comes when Goku reminds Krillin from the sidelines that he does not actually have a nose (a recurring joke about Krillin's character design). With this realization, Krillin becomes immune to the smell and quickly defeats Bacterian with a powerful kick.

Bacterian makes a brief reappearance at the 22nd World Martial Arts Tournament but is eliminated early. His character exists purely as a comedic obstacle, representing the original Dragon Ball's fondness for gross-out humor and absurd fighting gimmicks. He is one of many colorful tournament participants who highlight the series' early lighthearted tone.