Also known as: 梅沢八千代
Yaya is one of the characters that appears in Vocaloid producer Neru's music videos and made their debut in I~Ya I~Ya I~Ya (Vocaloid). Their full name is Umesawa Yachiyo as confirmed by Terada Tera, who designed the character. She is a girl with short Aqua Hair, a pink Hairclip and a pink Hat. Her design is partially based off Kagamine Rin.