The anime landscape is populated with numerous male characters whose eyes are their most defining feature. These characters have left an indelible mark on fans, often becoming archetypes of power and intensity.
Sasuke Uchiha (Naruto/Naruto Shippuden)
Perhaps one of the most famous examples, Sasuke's Sharingan, and later the Mangekyo Sharingan and Rinnegan, are the epitome of demonic eyes in anime. The Sharingan, with its distinctive red iris and tomoe pattern, grants him incredible visual prowess, including the ability to copy techniques, cast powerful genjutsu, and track fast-moving objects. As his power grows, his eyes evolve, reflecting his descent into darkness and his pursuit of vengeance. The Rinnegan, in particular, with its concentric rings, signifies a level of power beyond mortal comprehension, granting him access to the Six Paths' abilities. His journey is intrinsically linked to the evolution and burden of his eyes, making him a quintessential example of male anime characters with demonic eyes.
Lelouch Lamperouge (Code Geass)
While not inherently demonic in origin, Lelouch's Geass, a power granted by C.C., manifests as a distinctive red, circular pattern in his eye. This "Eye of Absolute Obedience" allows him to issue commands that cannot be defied. The power is immense and corrupting, and its visual manifestation is a constant reminder of the pact he's made and the moral compromises he undertakes. Lelouch's eyes are a symbol of his ambition, his strategic genius, and the heavy price he pays for his revolution. The intensity with which he wields his Geass, often accompanied by a chilling calm, makes his gaze unforgettable.
Ichigo Kurosaki (Bleach)
Ichigo's journey as a Substitute Soul Reaper is marked by the manifestation of his inner Hollow powers. During these transformations, his eyes often turn black with a yellow, glowing ring, or adopt a more menacing, Hollow-like appearance. This signifies the presence of his inner demon, a source of immense power but also a constant threat of losing control. His Quincy heritage also contributes to unique abilities and visual cues, but it's the Hollow aspect that most closely aligns with the "demonic" descriptor, representing a primal, destructive force he must constantly manage. The struggle for control over these powerful, often terrifying, eyes is central to his character arc.
Gray Fullbuster (Fairy Tail)
Gray's connection to his demon father, Silver Fullbuster, and his Ice Devil Slayer Magic grants him moments where his eyes take on a more intense, sometimes crimson, hue. This is particularly noticeable when he channels the full power of his Devil Slayer Arts. While not a constant feature, these flashes of demonic power, reflected in his eyes, signify his lineage and the potent, destructive magic he wields. His struggle to control this power, especially when it threatens to consume him, adds depth to his character.
Alucard (Hellsing/Hellsing Ultimate)
Alucard, the titular vampire, is a being of immense power and ancient evil. His eyes are a constant reflection of this, shifting in color and intensity. Most famously, they can glow a piercing red, often accompanied by a predatory grin. In his more monstrous forms, his eyes multiply, becoming a terrifying spectacle of countless glowing orbs. Alucard's eyes are not just windows; they are weapons, capable of instilling terror and showcasing his absolute dominance. His demonic nature is undeniable, and his eyes are its most potent herald.
Accelerator (A Certain Magical Index)
While not strictly "demonic," Accelerator's "Reflection" ability, which allows him to manipulate vectors, is often visually represented by his red, swirling irises. This unique ocular feature is a direct manifestation of his esper ability, one of the most powerful in his world. The intensity and unnatural patterns in his eyes convey a sense of otherworldliness and immense, dangerous power. His journey from a ruthless villain to a protector, often struggling with the consequences of his actions, is mirrored in the evolution and use of his distinctive eyes.
Kaname Tōsen (Bleach)
Kaname Tōsen's Zanpakuto, Suzumushi, grants him abilities that can manipulate sound and even induce paralysis. However, it's his Hollowfication that truly brings forth "demonic" eyes. When he embraces his inner Hollow, his mask forms, and his eyes often glow with a menacing red. This transformation signifies his embrace of a darker path and his pursuit of a twisted sense of justice, making his altered gaze a powerful symbol of his corrupted ideals.