Tuto functions as Birdy Cephon Altera's floating robotic companion throughout her Earth missions within the "Decode" anime continuity. Designed with a squid-like appearance, this hovering unit provides critical operational support. As Birdy's manager during her undercover identity as Japanese idol Shion Arita, Tuto handles scheduling, public relations, and logistical arrangements to maintain the pop star facade while concealing Birdy's true activities.

During investigations, the robot delivers tactical assistance through environmental scans, data analysis, and establishing Federation communication channels. Its capabilities include accessing surveillance networks, decrypting signals, and relaying real-time intelligence. Tuto remains instrumental across Birdy's cases involving the Ryunka superweapon and alien threats, actively participating in field operations by monitoring targets, coordinating with Tsutomu Senkawa during body-sharing incidents, and securing perimeters. Its analytical functions prove essential for tracking Ryunka mutations and identifying hostile entities.

Tuto occasionally exhibits programmed behavioral quirks, with one source likening its managerial mannerisms to a "gay Spock." The robot maintains a strictly professional dynamic with Birdy, adhering to operational protocols without displaying autonomous emotional development. Its origins are documented solely as Federation Police equipment, and the character appears exclusively in the "Decode" anime continuity without counterparts in the original manga, OVA, or subsequent "Evolution" manga storylines.