Figure | Dragon Ball Z | Krillin GXMateria | Banpresto

Krillin is a major supporting protagonist in the Dragon Ball series. He met Goku when they were kids and considered Goku his rival while they were training under Master Roshi. While he may be overpowered by major enemies throughout the series, Krillin is still considered an important member of the Z Fighters

Dragon Ball Z (from Dragon Ball Wiki)
Dragon Ball Z follows the adventures of the adult Goku who, along with his companions, defends the earth against an assortment of villains ranging from intergalactic space fighters and conquerors, unnaturally powerful androids and near indestructible magical creatures. While the original Dragon Ball anime followed Goku through childhood into adulthood, Dragon Ball Z is a continuation of his adulthood life, but at the same time parallels the maturation of his son, Gohan, as well as other characters from Dragon Ball and more. The separation between the series is also significant as the latter series takes on a more dramatic and serious tone. The anime also features characters, situations and back-stories not present in the original manga.