A hand-sized 1/6 scale cyberdoll from the Cyberdyne Corporation (not to be confused with The Terminator's robotic company, Cyberdyne Systems). Kazuya receives May because of an accidental order which happened as a result of a revenge tactic planted in a DVD-RAM from his rival, Nanbara. She has to be plugged into Kazuya's computer via a homemade cable in order to recharge her batteries because May's official recharging equipment was accidentally broken when Kazuya first received her. May was never paid for by Kazuya, and thus became a target for Sara and Cyberdyne in early episodes.
As a cyberdoll, she can control traffic lights and simple electronics, and can connect to personal computers via what may or may not be USB cables. She later becomes a human-sized 17-year-old version (courtesy of Cyber-X) following her repossession. Her personality is innocent, and at times childish and naive, though she also shows surprising insight and is always able to cheer Kazuya up. Unlike the other cyberdolls, May's Maid Program had evolved (according to Kei during her analysis), making her more human and resistant to the retro-cybervirus that threatened the other cyberdolls. She shows strong feelings towards Kazuya and is often competing with Kasumi. In the last episode it has also been stated that she can give birth.