Cube, a demon bound by unshakable loyalty, serves as steward to Yucie and her adoptive father, Gunbard. His arcane prowess allows him to summon enchanted artifacts through sorcery, though each conjuring demands payment in gold—a power he deploys strategically to aid Yucie in overcoming challenges. Beyond duty, Cube embodies both devoted guardian and trusted ally, intertwining his magic with the family’s needs.

Once steward to Glenda, heir of the Demon World’s throne, his service fractured when the princess’s mother exiled him for reasons shrouded in secrecy. Cast adrift, Cube was discovered by Gunbard, who offered him refuge and purpose. Now, his allegiance lies solely with Gunbard’s household, where his sorcery safeguards their endeavors and sustains their daily lives.

Cube’s form merges humanoid structure with subtle infernal markers—a silhouette tempered by the crisp elegance of a butler’s attire. His design balances otherworldly heritage and service, maintaining visual coherence across iterations.

Indispensable to Yucie and Gunbard’s pursuits, Cube bridges mystical skill and unwavering fidelity. Whether unraveling crises or quiet burdens, his calculated interventions and steadfast presence anchor their resilience, turning adversities into pathways through the precise application of gold and magic.