Raijin, originating from Japanese mythology, is the god of thunder and lightning who commands thunderstorms, traditionally depicted carrying drums that produce thunder when struck. This establishes his core identity as a deity of formidable power associated with natural phenomena. Within the narrative, Raijin encounters Tenkorin Okakura after she wishes for effortless realization of her dreams. Rather than granting the wish directly, he summons renowned historical artists from various eras to provide structured lessons on painting and artistic development. His actions reflect a deliberate mentorship approach, emphasizing learning through guidance over shortcuts.

Physically, Raijin possesses distinctive horns and pointed ears, aligning with traditional depictions of thunder deities, and often wears a headband emphasizing his mythological origins. Despite his imposing presence and association with destructive natural forces, Raijin demonstrates deep respect for artistic disciplines. His interactions with artists like Hokusai reveal humility and a willingness to engage in creative processes, positioning him as a facilitator of cultural and artistic education alongside his divine power.

Raijin's personality combines assertiveness and confidence; he often takes charge with a commanding demeanor. His guidance for Tenkorin involves challenges and structured lessons, reflecting his role as a catalyst for growth rather than a passive wish-granter. This aligns with descriptions of him as determined and fearless, traits consistent with his formidable mythological role. Throughout the narrative, Raijin focuses on fostering Tenkorin's development, using historical figures to instill principles of dedication and artistic refinement. His evolution highlights a balance between his thunderous divine nature and a commitment to nurturing human potential through disciplined learning.