Movie
Description
In the 1987 film Dragon Ball: Sleeping Princess in Devil's Castle, Krillin is presented as a young, ambitious martial artist at the very beginning of his journey. He travels to Kame House on a small island with the same goal as the protagonist, Goku: to become a student of the legendary martial arts master known as the Turtle Hermit. Krillin is depicted as a bald, short-statured boy who is savvy and street-smart, often acting as a foil to Goku's naive and innocent nature.

His personality in this story is defined by a strong sense of rivalry and a cunning, sometimes underhanded, approach to achieving his goals. From the moment he arrives, Krillin shows a willingness to use unsavory methods, famously offering a dirty magazine as a bribe to the easily swayed Turtle Hermit in an attempt to gain favor. Once the master sets the test to retrieve the Sleeping Princess from the perilous Devil's Castle, Krillin's competitive drive takes over. His primary motivation throughout the quest is not just to prove his strength, but to outdo Goku and secure the training spot for himself. He consistently attempts to sabotage Goku, using tricks and deceptive tactics to get ahead, highlighting his initial selfish and jealous nature.

Despite these negative traits, Krillin's role in the story is crucial as both a companion and a rival. His dynamic with Goku forms the core of the adventure, as their uneasy alliance forces them to navigate the dangers of the castle together. While he is driven by self-interest, he remains a capable fighter who participates in battles against the castle's demonic monsters. His relationship with Goku is complex; he sees him as an obstacle to overcome, yet their shared ordeal is the first step toward the deep friendship they will later develop. In contrast, his relationship with the Turtle Hermin is transactional, based on bribery and a shared, somewhat immature worldview. He also interacts with the wider cast, including Bulma and Yamcha, but his focus remains fixed on completing the mission before Goku.

This film represents an early stage in Krillin's character development. He begins as a sly and untrustworthy rival, but exposure to Goku's pure-hearted bravery and the escalating dangers of the situation begins to temper his worst impulses. By the end of the adventure, following the defeat of the vampire lord Lucifer, Krillin shows signs of contrition for his earlier behavior, though he is notably unable to offer a direct apology to Goku, suggesting his pride and stubbornness are still very much intact. The story concludes with the Turtle Hermin accepting both boys as his students, setting the stage for Krillin's transformation from a sneaky rival into a lifelong, loyal friend.

Regarding his abilities in the film, Krillin is shown to be a trained martial artist with a solid foundation in combat. He is agile and capable of fighting against the monsters and demons that inhabit Devil's Castle, though his power is portrayed as being largely on par with Goku's at this early point in their lives. While he does not display the elaborate energy attacks he is known for in later stories, his physical skills and cunning are enough to survive the castle's dangers. His most notable ability in this context is his resourcefulness and willingness to use any trick necessary to survive and succeed, which proves to be a valuable asset during their quest.