Having first met Goku back in Dragon Ball, Krillin is one of the immensely popular anime and manga franchise's longest lasting characters. Although in recent years he's taken a backseat due to his inability to compete with Saiyans like Goku, Vegeta and Gohan, Krillin is still a formidable fighter, and he might just be the strongest human in the Dragon Ball universe.
Towards the start of Dragon Ball, Krillin and Goku were rivals, but they eventually became great friends. He proves himself during the 22nd World Martial Arts Tournament in his battles against both Goku and Chiaotzu, defeating the latter through his cleverness.
As the series progresses, Krillin is one of the few to survive the battle with Vegeta and Nappa, who were more powerful than anyone the Z-Fighters had ever faced before. When Krillin and Gohan later travel to Namek, Krillin has his true potential unlocked, and he's further strengthened. On that planet, Krillin is able to hold his own against some members of the immensely powerful Ginyu Force. Although he's eventually killed by Frieza, Krillin manages to cut off the villain's tail with his insanely powerful Destructo Disc during their fight.
As the series continues, Krillin continually risks death to help his friends battle foes against whom he is hopelessly outmatched. Check out the video below for more of our theory on why Krillin is the strongest human in the Dragon Ball universe.
Although he's mostly been relegated to a supporting role in the series, Krillin went on to marry Android #18 and have a daughter, Marron, in the aftermath of the Cell Saga. In Dragon Ball Super's Universe Survival Saga arc, Krillin joins Team Universe 7, proving that many still view him as one of the universe's most formidable fighters.
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