Mega Man Star Force

Subaru Hoshikawa is an elementary school boy whose morale has been low since his father disappeared into space after a terrible accident. Things change abruptly when he encounters War-Rock, an alien made of radio waves from another planet.

This being tells him he knows something about his father, but there's a problem: he's being hunted by a host of other dangerous aliens. To get out of trouble, the two fuse together and become Rockman, capable of traveling along radio waves to destroy viruses and space monsters that threaten the planet. If you want an anime full of transformations, fast-paced battles, and plenty of action, dive in with your eyes closed.