GraP is a central figure in the comedic anime GraP & RodeO, serving as the catalyst for the series' events. He introduces himself as a self-proclaimed music producer who has traveled from the future with the specific mission of turning an ordinary high school student, Rodeo, into a rock star. His background is unusual: he was originally human, but his physical form was drastically altered into a small, round, creature-like shape due to the distorting effects of time warp or excessive time travel. Despite his bizarre appearance, he maintains his identity as a professional producer.

In terms of personality, GraP is characterized by an energetic and enthusiastic dedication to his self-appointed role. He is an unorthodox mentor whose methods are often questionable, humorous, or outright strange. For example, his advice might range from suggesting absurdly fashionable hairstyles from the future to playfully mocking his protégé. He is proactive and confident, taking charge of Rodeo's career path regardless of the young man's hesitations. Beneath this eccentric exterior, he demonstrates a genuine commitment to nurturing talent, as shown when he moves from teasing Rodeo about using only his voice to actively teaching him how to play the guitar. His motivations are clear and unwavering: to use his futuristic knowledge to mold Rodeo into a successful rock star, similar to the real-life musical duo GRANRODEO. He is driven by the act of production itself, becoming excited by the prospect of finding talent to develop.

GraP's role in the story is primarily that of the mentor and producer. He is the driving force behind the plot, pushing the more reluctant and straightforward Rodeo into various humorous situations for the sake of his musical education. He acts as the chaotic agent of change in Rodeo's otherwise ordinary life. His most significant relationship is with Rodeo, which is a classic comedic duo dynamic: the enthusiastic, unconventional producer and the skeptical, straight-laced student who grudgingly follows his instructions. While Rodeo may complain, he is fundamentally honest and receptive to GraP's guidance. GraP also interacts with Rodeo's friends, who inexplicably accept his claim of being a producer from the future without question. In the second season, after Rodeo forms the band Rodeo Spider, GraP's role expands to include managing the band and acting as its mascot.

Regarding development, GraP's core identity remains consistent throughout the series as the ambitious producer from the future. However, his role evolves as Rodeo's musical journey progresses. In the second season, his functions expand from purely producing to also handling managerial duties and serving as the band's mascot, indicating a deeper integration into Rodeo's musical life. His personality remains largely unchanged, though there is a humorous note that as a producer, he has a tendency to push himself to the forefront of the band's activities, which does not always endear him to others.

GraP possesses several notable abilities that aid him in his producing mission. His most distinctive physical trait is his antenna, referred to as the Produce Antenna, which stands up on his head when he becomes excited, either by discovering talent he should produce or by seeing something erotic. He is able to fly through the air using a producer cardigan tied around his neck. Beyond these physical quirks, his primary ability is his claimed knowledge of the future music scene, which he attempts to apply to make Rodeo a star. He also has a few defining quirks: his real name is given as Setokumarinzou, his favorite food is white rice, and his strange hobby is filing down bowling balls to create heart-shaped ornaments.