Alan Lidocaine, formally Allan Toin Lidocaine, hails from the noble Lidocaine family renowned for martial arts. As the eldest son, he carries pride from multiple martial arts competition victories and maintains a status-conscious attitude, striving to appease those of higher rank while looking down on those he deems beneath him. His background emphasizes the importance of appearances and societal perception.

He shares a contentious relationship with Selen Hemein, a fellow aristocrat burdened by scandal and the moniker "Cursed Belt Princess." Alan views Selen's notoriety as a threat to his social standing and military career, leading him to frequently nag and bully her regarding her behavior and appearance. Despite this, he harbors no ill will and possesses underlying good intentions, aiming to set a respectable example, though his approach remains flawed.

Alan's initial arrogance shifts dramatically after encountering Lloyd Belladonna during an attack by the Demon Lord Abaddon. Following Lloyd's assistance, Alan develops deep respect for Lloyd's abilities, declares himself Lloyd's student, and adopts a demeanor of earnest admiration. He actively assists Lloyd in enrolling at the military academy, reflecting his newfound loyalty.

Throughout official media, Alan wields a Gigantic Battle Axe as his primary weapon. His combat skills align with his noble lineage's martial heritage, though specific techniques remain undefined. His character development centers on reconciling his ingrained elitism with a genuine desire for self-improvement under Lloyd's inadvertent mentorship. His name derives from "Allantoin" and "Lidocaine," consistent with the series' theme of naming characters after chemical compounds.