Tsukasa Futaba is one of Subaru&#039;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.!~

In the year 220X, the world has advanced toward radio-wave technology, and the world is connected through the Wave Road. Meet Subaru Hoshikawa, a fifth-grade student who lost his father in a space accident. Subaru meets an extraterrestrial radio-wave being named War-Rock, descending from a distant FM planet. War-Rock claims to know about Subaru's father, but many alien beings are after War-Rock. The two work together and merge into Rockman, a radio-wave human capable of traversing the Wave Road and battling the radio-wave viruses and FMs that threaten the Earth.
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(Source: Anime News Network)

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The second series is to follow the events of the second video game, focusing on the lost continent of Mu. The ancient civilization vanished ages ago, and a few of its remnants still exist as myths and legends called UMAs (unidentified lifeforms). The UMAs begin merging with humans in order to search for the treasures of Mu, the powerful ooparts, which will give them the power to revive Mu. After Subaru and War-Rock encounter several unusual enemies, they meet a professor named Doctor Orihime who sends them on a quest to find the ooparts and stop the UMAs. Using the ooparts, Rockman is able to take new forms, including Thunder Berserk, Fire Dinosaur, and Green Shinobi. (Source: Wikipedia)