|Japanese translated||Prototype Ai-A|
|Anime debut||Yu-Gi-Oh! VRAINS episode 16: "Hack Attack"|
Prototype Green-A, known as Prototype Ai-A in the Japanese version, is a character appearing in the Yu-Gi-Oh! VRAINS anime. It is a prototype Dueling AI that was designed by Kitamura, who uses it to defend SOL Technologies' Data Bank.
Green-A is visually represented as a vaguely insectoid robotic figure with lime armor that has a teal, red, and yellow secondary color. It has a domed head with slitted green eyes sitting on top of an arrow-shaped teal collar. This symbol appears on its chest and shapes its navel, with a red stripe in between them. It has broad, domed shoulders with yellow spots that resemble eyes; causing its torso to resemble an open mouth. Its legs are armored in lime, with teal jewels at the knee, and its feet are shaped akin to shoes with the toes turned up in teal points. It has long teal forearms with elbow spikes and spindly tan fingers.
Kitamura began developing Green-A and Prototype Red-B shortly after he was promoted to chief of security for SOL Technologies. After completing the prototypes, he had them Speed Duel one another. An alert was triggered by Playmaker, who had invaded the Data Bank, and Kitamura deployed Green-A and Red-B to defeat Playmaker and capture his Ignis. Playmaker was initially able to evade them, but Green-A caught up to him and engaged him in a Speed Duel. It was able to deplete Playmaker's entire opening hand, but Playmaker was able to use the effects of the monsters in his Graveyard to counterattack, Link Summoning "Vector Square Archfiend" and defeating Green-A with it.
|Prototype Red-B||16||Not shown|