Originally a monk of the Orin Temple, after training there for eight years, Krillin came to Master Roshi and became a student of the Turtle School in his first appearance in the series. Originally a jealous and selfish person, Krillin did not respect rules when confronted with Roshi's training. After a short arch-rivalry between the two (Krillin even admitting that he hated Goku at first), he becomes Goku's best friend and his selfish and jealous personality becomes more kind-hearted and a lot more generous (although he still has slight selfish and jealous traits after his reform). Krillin is often used as comic relief or cannon fodder by the author, and has been killed the most amount of times in the Dragon Ball series. As the most prominent full-blooded human character in the Dragon Ball series, Krillin also represents a sense of normalcy to Goku and Gohan, as well as often being the most identifiable. Often when things in the Dragon World turn bizarre, it is left to Krillin to shake his head in disbelief and crack a joke.