Aoi Zaizen (Skye Zaizen in 4kids Dub) is a character appearing in the Yu-Gi-Oh! VRAINS anime. She is Yusaku's classmate. In Link VRAINS, she is a Charisma Duelist under the alias, Blue Angel (ブルーエンジェルBurū Enjeru) and later Blue Girl (ブルーガール Burū Gāru) while working with Ghost Girl. While teaming up with Aqua, she transformed into Blue Maiden (ブルーメイデン, Burū Meiden) to fight against Lightning to rescue her childhood friend, Miyu even if means that SOL Technologies might put a bounty on her.
Aoi is a fair-skinned young woman with light brown hair in a bob-cut and yellow eyes. Her standard attire is a uniform that consists of a slate-colored jacket with a light blue trim, which she wears over a light yellow jumper. Underneath, she has a white dress shirt with a blue tie and heart-shaped clip. Aoi's uniform also includes a short black skirt with black socks that reach below her knee and brown shoes.
As Blue Angel, true to her name, she has long blue hair that she tied into two with blue ribbons. Her eyes and eyebrows are also blue and she has a green clover tattoo on her right cheek. She wears a blue choker and pink heart-shaped winged earrings. Her outfit consists of a white sleeveless shirt with a blue necktie. Underneath, she wears a blue and pink dress with wing-shaped frills, and dark blue socks that reach her thighs. She wears dark and light blue boots with wings attached to each one. Lastly, she has a pair of white wings with pink heart-shaped and lavender clover-shaped patterns on each wing.
Aoi is described as being very quiet on first sight. However, as a Charisma Duelist, Aoi becomes very active in Link VRAINS.
"Aoi" (葵) means "hollyhock", a plant associated with abundance and great fortune and was also the emblem of the Tokugawa family. The characters that form "Zaizen" (財前) can be translated as "before wealth".