Fūrōta is a superhuman known as a ghost who becomes a member of the Superhuman Bureau. He possesses a youthful and carefree appearance, though his true age remains unknown. Prior to joining the Bureau, he spent his time amusing himself by using his abilities to play pranks, often on children.

His primary ability is his ghost-like nature, which allows him to phase through inanimate objects and hover in the air. He is also a shapeshifter, most frequently transforming into various animals, and he has demonstrated the ability to take the form of a bird. However, his phasing ability has a notable limitation: he cannot pass through objects that are being wielded by a person, and such objects can physically harm him. When he is introduced, he is shown releasing a beautiful insect from a cage in a department store, an act that sets the stage for a central tragedy in his life.

Fūrōta is characterised by a generally nice disposition with a pronounced mischievous streak. He is immediately and strongly attracted to Kikko Hoshino, a magical girl and fellow Bureau member, and his desire to be near her becomes a primary motivation in his early actions. This infatuation leads him to desperately want to join the Superhuman Bureau, and he seeks to prove his worth to them by taking on a dangerous mission. His motivations are not solely based on affection; he initially holds a simplistic, childlike view of heroism where clear villains are defeated by good superhumans, and he sees himself as a hero within that framework.

His role in the story is deeply tied to a tragic mistake born of this simplistic worldview. Anxious to impress Kikko and secure his place in the Bureau, Fūrōta takes an ancient, potent virus created from giant insect corpses. He releases this virus to destroy the Tartaros Bugmen, who had created a deadly Black Fog that engulfed the National Diet building. His actions successfully disperse the fog and save the politicians, but have an unforeseen and catastrophic consequence: the virus annihilates the entire race of Tartaros Bugmen. Unbeknownst to him, the beautiful insect he had freed and befriended earlier, a young woman named Campe, is the queen of the Bugmen. By killing her people, Fūrōta leaves her as the sole survivor of her species.

This event becomes the defining tragedy of his existence and the crux of his character development. The narrative of Concrete Revolutio frequently jumps between timelines, showing a future Fūrōta who is far more somber and serious. In this future, he is confronted by a grown and vengeful Campe, who seeks to kill him for the genocide of her people. During this confrontation, a deeply distraught Fūrōta laments the loss of his old, simple world, crying that things have become too complex and questioning whether he was ever a hero at all. This marks his transition from an innocent, prank-loving ghost to a tragic figure grappling with the unintended consequences of his actions and the moral ambiguity of his former ideals.

His key relationships are central to this development. His bond with Campe is the most tragic; an innocent offer of friendship is shattered by an act of inadvertent mass murder, transforming a potential friend into a vengeful enemy. His relationship with Jiro Hitoyoshi, another Bureau member, is also significant. In the future timeline, Jiro and Fūrōta are enemies, yet Jiro intervenes to stop Campe from killing Fūrōta, convincing him that surrendering his life would not atone for what he had done. This complex dynamic underscores the show’s themes of justice and responsibility. Fūrōta is formally admitted to the Superhuman Bureau when Jiro casts the deciding vote, believing that the ghost's simple attitude toward fighting evil would help him remember the Bureau's original cause.