Aiko Kudou studies in Class 2-A at Fumizuki Academy, ranking within the top ten students of her year after transferring near the end of her first year.

She stands 5'2" tall, weighs 46 kg, and possesses light green hair styled in short spikes along with hazel eyes. Her physical appearance includes a modest chest size, noted to appear more pronounced in contexts like bathing.

Her personality is mischievous and easy-going. Aiko refers to herself using the masculine pronoun "boku" and frequently directs provocative remarks towards male classmates such as Akihisa Yoshii and Kouta Tsuchiya, often inducing comical nosebleeds. She contrasts Kouta's theoretical knowledge by emphasizing her own "practical" understanding in certain subjects. Aiko maintains friendships across class divisions, notably with classmates Shouko Kirishima and Yuuko Kinoshita, irrespective of academic rankings.

Aiko demonstrates exceptional skill with electronic gadgets, particularly using a micro-recorder to edit and splice recordings, manipulating conversations and causing misunderstandings, especially for Akihisa Yoshii.

Her Summoned Being wears a sailor uniform and wields a battle axe augmented by an electrical accessory. An alternate occult-themed version resembles a Noppera-bō (faceless spirit), symbolizing a potential desire to conceal her true self.

Aiko harbors romantic feelings for Kouta Tsuchiya, demonstrated through actions like encouraging him to view her swimsuit. A simulated future child between them inherits her appearance and Kouta's eyes, displaying a serious demeanor with an unexpected interest in eroticism. Another simulation suggests her future career as a doctor.

Her given name "Aiko" derives from "ai" (love/affection) and "ko" (child). Her surname "Kudou" combines "ku" (worker) and "dō" (wisteria).