Igneo serves as a command officer and captain in the Arachna Royal Military, renowned for his strategic mind and strong sense of honor. Approximately 17-19 years old, details about his early life, family, home village, or the circumstances of partnering with his battle spider, Flame, remain unspecified. Calm and dedicated, he occasionally displays a short temper, especially when facing disobedience. He harbors a fear of ghosts (phasmophobia) but typically denies it. Igneo acts as a mentor to Hunter Steele, taking his training seriously and challenging him to an initial duel to assess his ability to cooperate with his spider, Shadow—an encounter transitioning from skepticism to mutual respect.

His appearance features indigo hair and hazel eyes. In civilian attire, he wears a black long-sleeved shirt under a faded yellow shirt, a white scarf across his chest, a white belt, black pants, and black boots. As a Spider Rider, his armor includes gold plating on the left shoulder, a white cape, a long white glove on his left arm, and white-and-gold boots. In combat, Igneo wields a cavalry lance capable of emitting flames from its tip.

He forms one half of the warrior duo "Arachna’s Claw and Fang" alongside his oldest friend and friendly rival, Slate; Igneo represents "Fang." Their coordination proves exceptionally effective, even without summoning Flame during joint operations. Igneo demonstrates unwavering loyalty to Arachna Kingdom’s royalty, consistently aiding Prince Lumen and Princess Sparkle. Socially popular, he notably attracts a fan club among Arachna castle's female residents; this club disbands during his absence in Nuuma as members find other relationships. Romantically, he develops feelings for Nuuma's Queen Luuma. His name derives from igneous rock, formed from cooled magma, reflecting the thematic connection to fellow Rider Magma.