Nikaidou, Akira

二海堂昶

Born on December 11. Blood type B. Height: 175 cm (approx. 5'7"). Weight: 57 kg (approx. 125 lbs).
Akira is the 16-year-old protagonist of the series, currently in his second year of high school. He is strong and impatient, frequently skipping classes because he finds school boring. Despite his frequent absences, he still manages to rank within the top five students in his school.
Transforming into his shadow form turns his hair black, changes his clothing, and turns his eyes red. To maintain his human form, Akira relies on Shirogane serving as his shadow in the manga, whereas in the anime, he eventually utilizes a doppler item. While in his spirit form, he initially fights with a pair of daggers, but these are later replaced by a more complex and larger set of blades.
Although it is stated that he belongs to the royal line of light, making him a Rei, the truth is that he is Ryuko's successor. Currently, Akira has not yet awakened, leaving him unable to recover his memories from his time as king. However, he did awaken once before, during the period when he and Kengo first met Kou. He assumed his Rei form to subdue and defeat Kengo, simultaneously preventing Kou from carrying out a suicide attack. Because Ryuko had not fully regained his strength, he could not sustain that form and reverted to Akira, who collapsed from exhaustion. Kou erased Akira's memory of this event, along with Kengo's, believing the incident was too much for both of them to handle, but Akira has recently regained that memory.