Jun Takigawa is a character who serves as the trusted assistant to Kyoko Asechi, the head of the entertainment agency Pretty Top. His background is marked by personal tragedy, as he was orphaned shortly after birth when his parents died in a car crash. He was discovered at the accident site and subsequently adopted by Kei Asechi, Kyoko's mother, who raised him within the Asechi family. This led to the long-standing belief that he and Kyoko were biological half-siblings, a fact that was later revealed to be incorrect.

In terms of personality, Jun is characterized by a poetic and perceptive nature. He frequently speaks in a philosophically inclined manner and has a notable habit of randomly inserting English words and phrases into his dialogue, though his pronunciation and usage are often unconventional or incorrect. He is known for reciting poems that leave some characters confused, while others, like Mion Takamine, seem to grasp their meaning. Jun possesses a sharp intuition and a strategic mind, which he often uses to hint at future events. He also has a playful, if somewhat peculiar, sense of humor, as demonstrated when he orchestrated a plan involving a giant dumpling to sabotage a marriage interview for the president.

Jun's primary motivation is the well-being and protection of Kyoko Asechi. His loyalty to her is the driving force behind many of his actions, leading him to conceal painful truths about her father's past in an effort to shield her from emotional distress. He is deeply perceptive when it comes to talent, fulfilling a key role in the story by identifying promising Prism Stars. He is the person who scouts the main protagonist, Aira Harune, recognizing her innate potential. He is also able to see a person's star aura and believes that Aira, Rizumu, and Mion are destined to be together.

Jun's key relationships are central to his development. He is constantly seen alongside Kyoko Asechi, acting as her dependable aide and confidant. A significant subplot involves Mion Takamine, who has a strong admiration and crush on him, although this affection is not returned romantically. His role in nurturing young talent continues into the sequel series, where he adopts the flamboyant alter ego of Prism Ace, a masked identity that unexpectedly becomes the object of Mia Ageha's romantic interest.

Jun experiences considerable character development regarding his own identity. The revelation that he is not actually Kyoko's half-brother but her adopted ward dissolves the perceived sibling tie between them. This discovery unlocks the potential for a romantic bond that has been built on years of intertwined history and mutual trust. Following these revelations and the conclusion of a major competition, his arc culminates in him proposing to Kyoko, which she accepts. The story concludes with them visiting the grave of his birth parents, signifying a closure of his past and the beginning of a shared future as equal partners.