Mitty was a vagabond who searched the rubble-strewn remains of cities for food. When Sandy found her she began following Sandy's band of resistance fighters. Mitty is still quite young but full of optimism and tough enough to keep up with everyone. Her knowledge of the sewer systems of some areas comes in handy for her new friends.
Gorn is a being made up of the collective mind of the MME. It is filled with hatred for humanity and a strong desire to prove that the MME have surpassed humans. Directly controlling the MME forces from its heavily defended citadel, it desires to take its war against humanity to every outpost in the solar system until none remain alive. It speaks of the glorious future that awaits when mechanical life comes into its own and claims the solar system. Although a machine, Gorn is not devoid of emotional attachments and has a special desire to see Sandy suffer because she is the daughter of the man who uncovered the alien ruins on the Moon. When Sandy confronts Gorn at the heart of its citadel it is forced to consider ideas it cannot handle and self destructs rather than deal with the consequences.
A follower, not a leader, Patty's distinguishing characteristic is her tendency to go into trance-like moments of distraction. This trait may be related to why she does not reject the experiment the way Eluza did.
General Nelson is the leader of the remaining forces of the West's army in Australia. He coordinates his forces closely with Dominov's after they learn to trust each other at the end of the first chapter of the story. Nelson is a capable leader.
War-Rock is a Denpa life form who made contact with Subaru upon reaching earth. Together they become Rockman. Although he is thought to be from the planet FM, he is the last survivor of the AM planet that was destroyed by the FM King.
Shooting Star Rockman, or simply Rockman, is the main character for the Ryuusei no Rockman anime series, manga and videogames. He is the Denpa Henkan (fusion) of Subaru with War-Rock, this gives him the ability to see and walk on Wave Roads and to use Battle Cards to fight viruses and enemies.
Tsukasa Futaba is one of Subaru's classmates, who is always seen with a Wave Scanner in his hand (which contains Gemini). He was involved in a vehicle accident in which a truck hit him as he was crossing the street. He was left to dead when Gemini saved him and offered him power. He accepted this power and became possessed by Gemini. Tsukasa can perform Denpa-Henkan with Gemini to become Gemini Spark. In this form, he takes on two bodies - a white and a black version. They both seem to have slightly different motives. Gemini Spark is viewed as the main antagonist in the anime. Gemini Spark kills all of the FMs (save Cancer and Harp) in order to collect the Negative Energy that FMs are made out of. This Negative Energy is manifested in the Andromeda Key. Gemini Spark Black grew impatient collecting the Negative Energy and prematurely summoned Andromeda. However, thanks to Rockman and the AM Sages, Andromeda was defeated. Gemini Spark Black is literally stabbed in the back by Gemini Spark White who sacrifices his other self to collect the Negative Energy and restore Andromeda to its full power. Gemini Spark White is later destroyed by Cepheus, but Tsukasa is unharmed with no memory of the ordeal.