Itsuki Katagiri, a 16-year-old male idol, stands out as the youngest yet tallest member of his group at 185 cm, his pale complexion framed by wavy brown hair and turquoise eyes accented by a beauty mark near his left eye. Born on January 21 under the Aquarius sign with AB blood type, he balances high school studies and idol commitments from his agency-adjacent apartment, maintaining close family ties to their sweet shop—a source of treats he shares generously with peers. His household, including parents, a younger sister, and the beloved cat Maron, whose belly he affectionately nuzzles, anchors his grounded nature.

Gentle and level-headed, Itsuki often mediates group tensions with calm reason, blending kindness with quiet determination to pursue both college aspirations and performing. His soft spot for children shines during fan interactions, while dance remains his forte, sparking a growing passion for choreography. Within idol unit DearDream, he partners with childhood friend Chizuru Sawamura in subunit W-MaSKat, tempering her eccentricity with steady support. A nuanced rivalry with Junya Sasaki reveals mutual admiration—Itsuki envies Junya’s discipline, while Junya respects his innate talent—bridged by eventual acceptance of Itsuki’s dual priorities.

Early storylines showcase his knack for resolving conflicts, from decoding song lyrics to addressing teammate Shin Oikawa’s struggles. Onstage, his signature call—“Kono ki nan no ki?”—ignites audience chants of his full name, cementing his unique presence. Through challenges, Itsuki evolves, harmonizing personal ambition with collective purpose as he navigates the complexities of growth, responsibility, and camaraderie.