Akira Fudo is a teenager who merges with the demon Amon during a Black Sabbath ritual. His pure heart overpowers Amon’s consciousness, allowing him to retain his human mind while gaining demonic abilities. This fusion creates Devilman, a being with superhuman strength, speed, reflexes, flight, energy projection, fire breath, limb extension, and teleportation. In human form, Akira develops a more athletic physique after the fusion, with black facial markings appearing under his eyes. As Devilman, he possesses bat-like wings, a spaded tail, black fur on his lower body, clawed extremities, and a distinctive red forehead crest. Initially meek and emotionally sensitive, Akira becomes more assertive and confident after merging with Amon, occasionally showing perverse tendencies but retaining his core empathy and protective instincts. Abandoned by his parents, he is raised by the Makimura family and shares a sibling-like bond with Miki Makimura, who serves as his primary emotional anchor. His childhood friendship with Ryo Asuka turns to betrayal when he discovers Ryo’s true identity as Satan. In Amon: Apocalypse of Devilman, witnessing the brutal murder of Miki and her brother Tare by a paranoid mob traumatizes Akira, causing him to lose faith in humanity. This creates an opening for Amon to fully manifest and seize control of their shared body, unleashing indiscriminate slaughter of humans and demons, specifically targeting Saylos and his demon army. During an internal struggle within their shared consciousness, Akira confronts Amon and overpowers him through relentless right-handed punches, regaining control. In the aftermath, Akira encounters Satan but rejects confrontation, walking past him without engagement. His saga continues across other narratives, including Devilman Lady, where his spirit drifts through Hell and bonds with Jun Fudo.