Krillin's ability to breathe through his skin in Dragon Ball was later forgotten but it could have had major plot impacts in DBZ and Super.
The article from Fandom Wire discusses a lesser-known aspect of Goku's original rival in "Dragon Ball," Yamcha. It highlights that Yamcha, who was initially portrayed as a formidable opponent to Goku, possessed a genetic superpower known as the "Wolf Fang Fist" (Rōga Fūfū Ken), which was inspired by his wolf companion, Puar. This technique was meant to be a significant part of his fighting style, but as the series evolved into "Dragon Ball Z" and "Dragon Ball Super," Yamcha's character development and this particular ability were largely forgotten. The article reflects on how Yamcha's potential was sidelined, focusing instead on other characters like Goku, Vegeta, and Gohan, who took center stage in the more intense battles of the later series. This oversight by Akira Toriyama, the creator, has led to Yamcha being remembered more for his comedic moments and less for his initial prowess and unique abilities.