Gunther, father to Myne, Tuuli, and Kamil, shares a marriage with Effa. Born as a woodworker's son, he once dreamed of knighthood inspired by minstrel tales but became a soldier when societal barriers blocked commoners from that path. Joining the city guard under Effa's father, he advanced to captain and later gate commander. His duties began at the southern gate before rotations shifted him to the eastern and northern gates per standard guard relocations.

Blue-haired and light brown-eyed, Gunther sports a muscular frame that initially struck Myne as imposing. He typically wears a blue tunic. Devoted to his family, he eagerly discusses them with listeners, transforming into fierce protectiveness during threats—like confronting the High Bishop despite death penalties for resisting nobles. Determination defines him, seen in relentless marriage proposals until Effa accepted. He envies his daughters praising other men without crediting him, though quick reconciliations follow when they reaffirm his value. Secretly, he studied literacy to preserve paternal pride after Myne learned letters from Otto.

Family anchors Gunther. He shares a strong bond with Effa, whose beauty contrasts with his rugged appearance per Otto's observation. As a parent, he shows particular attentiveness to Myne, partly driven by her Devouring-induced fragility, extending protectiveness to Tuuli and Kamil. After Myne's adoption by the archduke transforms her into Rozemyne, a magic contract bars familial acknowledgment. Despite this, he probes temple guards for news and volunteers for assignments enabling indirect contact.

Gunther's narrative unfolds through key phases:
- **Early Family Life**: He permitted Myne's material-gathering efforts only after stamina development, supporting her despite health limits.
- **Temple Confrontation**: When the High Bishop tried conscripting Myne, Gunther physically intervened against priests despite lethal risks, triggering Myne's mana outburst and High Priest mediation.
- **Kidnapping Defense**: During attacks by Count Bindewald and the High Bishop, he battled devouring soldiers alongside Damuel and Otto, shielding Myne from magical assaults and suffering severe injuries before Rozemyne's noble ascension.
- **Post-Adoption Adjustment**: He attended Myne's staged funeral and obeyed the magic contract severing family ties. Promotion to gate commander followed his predecessor's dismissal for ignoring security protocols.
- **Continued Connection**: Despite the contract, he facilitated discreet updates on Rozemyne and joined her Hasse expedition security. He confronted Lady Clarissa at the west gate during her unauthorized entry attempt, extracting details about Rozemyne.

Skilled in combat from military training, he confronts multiple foes like armed priests and devouring soldiers. Near-professional woodworking endures from his heritage. He savors behelle's refreshment post-work and indulges in lengthy daughter-focused talks when prompted. Rozemyne cites his unconditional protectiveness as her ideal spousal benchmark, referencing him when evaluating partners like Eckhart and Karstedt.