Hiroki Ikushima devises the specialized protective suits enabling D-Pilots to withstand the corrosive digestive fluids of Organic Transformed Flyers. A perfectionist wholly absorbed in refining his designs, he prioritizes technical precision over social engagement, maintaining a polished yet detached composure. His interactions, largely confined to professional consultations or suit-testing protocols, reinforce his reputation as a solitary figure indifferent to distractions beyond his work. Nao Kaizaki, a fellow D-Pilot candidate, harbors a persistent, one-sided infatuation toward him, met with polite but unambiguous disinterest. No personal history, external motivations, or narrative development beyond his role as the suits’ designer have been documented.