Steiner, alias Shutina, stands as one of the Demon Army’s Heavenly Kings and its formidable magic general. This succubus cuts a striking figure with her statuesque frame, cascading golden ponytail, and piercing violet eyes framed by pointed ears. She dons a regal purple ensemble—elegant opera gloves, a hooded dress, thigh-high boots, and signature glasses—while wielding Claustrum, her arcane staff.

Beneath her composed exterior lies a perfectionist drive; she shoulders the army’s administrative burdens alone, pushing herself to exhaustion rather than relying on subordinates she deems inadequate. Though unmatched in spellcraft, her reliance on magic proves her Achilles’ heel—a vulnerability Leo exploited by nullifying her powers, resulting in a crushing personal defeat.

Her centuries-spanning loyalty to Demon Queen Echidna, her childhood companion despite their three-century age gap, fuels her relentless efforts to rebuild their realm post-defeat. Delegation remains a struggle, particularly with the whimsical General Lily complicating supply lines.

Her dynamic with Leo shifts from bitter rivalry to reluctant dependence. His tactical ingenuity earns her wary trust, though their exchanges simmer with charged banter—his teasing provocations met with frosty retorts. A pivotal dungeon expedition forces her to deploy a succubus charm spell—reserved for binding a "One True Love"—to secure Leo’s aid, an act both tacitly ignore. Their discovery of a shrine housing obsessive tributes to her deepens their uneasy pact of silence.

As the army’s arcane strategist, she commands unparalleled mystical expertise and fiscal acumen, her spreadsheets as vital as her incantations. Only Echidna witnesses her unguarded moments, breaching her stoicism during private conferences that underscore their profound bond.