This figure captures the imposing presence of Diablo, the demon lord from Tensei Shitara Slime Datta Ken during the Walpurgis event. Standing tall at 225 mm, it presents a lithe silhouette cloaked in dark, intricately molded armor with sharp-edged plates that catch the light with subtle highlights. His horned headpiece frames piercing crimson eyes and a stern, calculating expression. A sweeping cape or mantle flows behind him, with ornate gold accents along the edges, conveying both nobility and menace. The base depicts a ruinous scene, complementing his demonic aura and the dramatic pose suggests motion, ready to strike.

Diablo is introduced as one of the most ancient and formidable demon lords within the world Rimuru inhabits. In the Walpurgis arc, he appears as a brilliant tactician and merciless enforcer who commands respect from allies and fear from enemies. His history is tangled with centuries of power, cunning, and a complex relationship with his former master or rivals among the demon factions. The narrative follows his rituals, negotiations, and battles that shape the balance of power. Though he displays cold calculation, hints of loyalty and honor surface in critical moments, revealing a layered villain who seeks domination while occasionally questioning his own boundaries.