Demia serves as Commanding Officer of the Guardian Knights of Orvel, a respected military order. She bears the moniker "Fortress of Steel," earned through extraordinary mastery of the lance and legendary skill wielding a massive, near-impenetrable shield. This reputation is built on her formidable defensive prowess and leadership.

She demonstrates profound loyalty and commitment to her subordinates. Her actions and motivations are consistently driven by steadfast dedication to protecting her homeland and fulfilling her duties. Demia approaches her responsibilities with gravity and unwavering resolve.

Recent shifts in Orvel's royal court politics have led Demia to proactively seek the swift appointment of Clause as her designated successor within the Guardian Knights. This decision stems from her need to dedicate her full attention and capabilities to safeguarding Scarlet, who faces rising hostility and political maneuvering from the aristocracy—a protective role Demia deems paramount.

Demia is 25 years old; her birthday is January 30. Information regarding her background prior to commanding the Guardian Knights, her family lineage, or significant character development arcs occurring outside her established leadership role, political concerns, and protective duties within the setting is not provided.