Lucia Fex is the chief engineer and inventive force behind Burning Rescue, designing and maintaining cutting-edge firefighting gear like Galo Thymos’ signature Matoi Tech. Her hands-on approach thrusts her into active missions, where she prioritizes real-world testing of prototypes over standard procedures, embracing calculated risks with a bold, improvisational streak. Confident in her intellect, she self-identifies as a “genius” while rejecting both the “mad scientist” stereotype and commercialized innovation, viewing pure creativity as a higher calling. Petite and pale, she stands out with cyan eyes and blonde hair streaked with pink, twisted into twin buns. Her wardrobe merges lab-coat professionalism with punk flair: a lace-detailed white coat drapes over a black bra, red plaid skirt, and purple-black striped thigh-highs, accented by orange goggles, a respirator, and chunky platform sneakers. In the *Galo-hen* OVA, she initially scoffs at Galo’s admiration for historical firefighting techniques but begrudgingly respects his unorthodox effectiveness, later using data-driven analyses to validate his high survival rates. Throughout the main film, she troubleshoots equipment mid-mission, rebuilds Galo’s Matoi Tech post-imprisonment, and co-designs a specialized drill with Heris Ardebit to breach the Parnassus’ core. Her dynamic with teammates balances collaboration and friction. She operates in sync with Varys Truss on mechanical projects, shares a pre-mission fist-bump ritual with him and Remi, and tolerates Galo’s impulsiveness as a necessary testing ground for her gear. Though initially irked by his brashness, she voices skepticism over his arrest, signaling underlying loyalty. Interactions with Aina Ardebit remain pragmatic, while a tense alliance with Heris yields critical results despite past friction. A rat named Vinny perches on her shoulder or workstation, their bond unexplained but ever-present. Snacks and lollipops clutter her locker, suggesting a penchant for sweets amid her workaholic tendencies. Early concept art envisioned her as taller and more mature, with Nui Harime-inspired hair, later streamlined into her final design. Subtle nods, like a *Galo-hen* monitor displaying Trigger’s Spring-chan, tether her to studio lore. Etymology underscores her role: “Lucia” (light) and “Fex” (Latin for “maker”) cement her identity as Burning Rescue’s brilliant problem-solver, illuminating paths through crisis with relentless innovation.