Hoshikawa, Subaru

星川スバル

Hoshikawa Subaru serves as the series' main protagonist. Following a Denpa-Henkan with War-Rock, he is known by the name Rockman.
Subaru is a bright yet somewhat lonely fifth-grader who grieves the disappearance of his father three years ago, leading him to neglect his schooling. When classmates pressure him to return to school, he retreats to an observation deck. There, using the Visualizer glasses bequeathed by his father—which enable him to see the EM Wave World—he discovers War-Rock, a fugitive FM-life form and survivor of the AM Planet's destruction. War-Rock, who has stolen the mysterious Andromeda Key from the FM King, claims to possess information regarding the boy's missing parent. The two merge, allowing Subaru to utilize this newfound power to defend his friends and others from invading FM-life forms. Initially, War-Rock is unsettled by this, as Subaru's emotions are alien to him. While War-Rock's primary goal is safeguarding the Andromeda Key, this objective aligns with protecting Earth, causing him to gradually develop care for both the planet and Subaru.