Takumi Kindaichi is a mecha otaku with extensive mechanical knowledge, frequently identified by his thick glasses. His expertise in mechanics is substantial enough to impress professionals, marking him as highly capable in technical matters. He demonstrates awareness of underlying secrets within Akagi and habitually accesses restricted areas covertly, particularly the hangar housing the humanoid weapon Musashi.

Midway through the narrative, his deepening curiosity about the true nature of Ixia and Oblivion Bay drives him to seek understanding. This pursuit leads to his formal acceptance onto the technical team operating from the Rogue Hangar facility, transitioning his role into active participation with the maintenance and development staff for the Rogues, humanity's combat machines.

His technical proficiency extends to practical mecha design, resulting in the creation of the specialized combat unit Fire Loader. This mecha's design incorporates analysis of combat data from the Draktor-engineered Balrog unit, prioritizing enhanced movement flexibility, diverse attack capabilities, and improved heat resistance tailored to the pilot Masamune's requirements.