Masaoka Azuki (正岡小豆) is is a Japanese VOCALOID developed and distributed by YAMAHA Corporation in collaboration with SEGA. She made her debut as a main character in Project 575 and utilized the VOCALOID2 engine. She was released for the VOCALOID4 engine in July 2017.
She is voiced by Yuka Outsubo, a professional voice actress and singer.
Her birthday is June 11, she's a Gemini, and her blood type is O. Azuki is described as being cheerful and positive unlike Matcha. She's very open towards her feelings and tends to act first and think later.
In Go! Go! 575!, she is made out to be an awfully forgetful but eccentric person and somewhat impatient. She is also affectionate, effusive, and "clingy" (according to Matcha), often showing exaggerated displays of affection. She is shown to be scared of kites and would cower behind Matcha whenever one appears. Azuki also seems to be fond of food as she often suggests that they go to cafes, and even suggested they sing about hotcakes. Both she and Matcha seem to be oblivious to Yuzu's "fantasies" of the two.
Azuki was illustrated by Hiro Kanzaki, thus having a moe style with rounded features that are characteristic of the illustrator's style. She has red hair tied in a bun or chignon held by an exotic floral hair tie. Due to her background within the game, she is usually depicted in casual or school-related outfits.
Masaoka Azuki and Kobayashi Matcha were featured in Utayomi 575, the first iOS app to feature their VOCALOID2 voicebanks. They later appeared in the PS Vita game Uta Kumi 575 and the anime project GO! GO! 575. However, these vocals were not commercialized and were restricted to the games only. They did not see a public release until July 2017 for the VOCALOID4 engine.