Leviathan is rendered with a dynamic, commanding presence. The figure is poised in a dramatic stance that suggests a calm yet vigilant sea-demon ready to unleash power. The Murasaki no Koromo version is highlighted by an elegant flowing robe with coral-like folds and wave-pattern details that cascade down the figure, accented by subtle metallic flecks. The color scheme blends deep purples, midnight blues, and soft lavender to convey mystery and majesty, while translucent aqua highlights give the impression of water moving around the form. The stand and base evoke a foaming sea, completing the marine ambience of the scene.

Leviathan is introduced as a formidable entity bound to the sea, whose origins lie in ancient maritime legends that predate the major conflicts of the Seven Deadly Sins. Gifted with dominion over water and storms, Leviathan's motives are often shrouded in ambiguity, oscillating between protector of the deep and harbinger of chaos. Throughout the series, this character confronts rival forces, tests the allegiance of the protagonists, and reveals a complex history tied to ancient oaths and forbidden pacts. Leviathan's presence raises the stakes in battles, as its water-born abilities reshape terrain, alter strategies, and force allies to rethink trust, restraint, and the possibility of redemption in a world of coercion and power.