He Has No Sense of Smell and Breathes Through His Skin
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Krillin is one of the few ordinary humans in the Dragon Ball franchise, but he’s not 100% biologically normal… Krillin doesn’t have a nose and we discover this odd characteristic of his when battles Bacterian. This gargantuan bully uses body odour to overpower his enemies. It appears to work on Krillin until Goku reminds him that he has no nose. After that, Krillin has no problem defeating the great buffoon. Akira Toriyama later revealed that Krillin has no nose or sense of smell, and that he breathes through his skin.