Hiroshi is Akuto's self-described minion much to Akuto's dismay. A boy of small stature, he is frequently and savagely bullied and he sees Akuto as his protector. His desire to become Akuto's servant began when Akuto gave a speech in class that touched him, although its debatably anarchistic climax terrified the rest of the class. Despite looking up to Akuto, he believes him to actually be evil and often misinterprets his intentions, giving counterproductive advice as a result.

Brave is the superhero alter-ego of Miwa Hiroshi, which he acquired after he found the AI Unit D13 in the depths of the lake near his village, in accordance with a prophecy from his grandfather. The unit gave him a power suit armed with many weapons such as lasers, plasma cannons, and energy blades. Hiroshi keeps his identity as Brave a secret from everyone else.