Azuki Masaoka, a central figure in the multimedia Project 575, embodies a lively spirit intertwined with traditional Japanese poetry. Her name, inspired by the red azuki bean, mirrors her vivid red hair and signature color palette. Designed by Hiro Kanzaki, her aesthetic blends rounded moe-style features with striking details: crimson hair styled in a bun accented by an ornate floral accessory, casual or school attire, and a Vocaloid4 idol ensemble comprising a white sleeveless top, frilled pink skirt, elongated gloves, ribbon-decorated boots, and a black "A" insignia at her waist.

Exuberant and spontaneous, Azuki contrasts her composed friend Matcha through unfiltered emotionality and impulsive decisions. Her affectionate demeanor occasionally escalates into clinginess or overenthusiasm, tempered by a quirky forgetfulness and low patience. She harbors a fear of kites, often seeking refuge behind companions, and prioritizes culinary delights—café outings and hotcakes frequently steer her choices during group endeavors.

A cornerstone of Project 575’s poetic gameplay, Azuki crafts haiku and tanka verses in rhythm-based word games. Her interactions with classmates—Matcha (her steadfast confidant), the whimsically imaginative Yuzu, and Koume—highlight her role as an energetic social hub, sparking collaborative efforts despite occasional tactlessness.

Her Vocaloid4 voicebank, initially exclusive to *Utayomi 575* and *Uta Kumi 575*, launched commercially in 2017. The voice exudes a bright, dynamic tone ideal for pop, rock, and high-energy tracks, spanning F2–C4 with a 70–180 BPM sweet spot. Technically tailored for lyric composition over existing melodies, it reinforces Project 575’s fusion of music and verse.

Background notes list her birthday as June 11 (Gemini, blood type O) and height of 154 cm. Though her narrative lacks defined arcs, persistent traits across games and anime cement her as a creatively driven, transparently emotional force balancing inventiveness with occasional haste.