Damian emerges in the anime's fourth season premiere as a core member of the Elemental Siblings, or Gensou-Geschwister. This group, former knights of Gallia bound by blood or deep familial ties forged in service, includes Jacques, Bleu, Jeannette, and Damian. Despite seeming the youngest, Damian commands leadership. His siblings accord him significant respect, bordering on subservience, with Jacques displaying an element of fear.

Damian presents as a short, young boy with bright blonde hair and piercing blue eyes. He typically wears a cape over a shirt and suspenders. While wielding an ordinary wand, his true power lies in alchemy transmutation—the ability to manipulate matter at a subatomic level. A unique device, resembling an odd trumpet with a button, serves as his primary instrument for this magic.

His alchemy transmutation enables dramatic environmental transformations. A notable instance occurs during an encounter with the Desert Elf, where Damian effortlessly uses the trumpet to transmute solid desert bedrock into a deep pool of water, requiring minimal movement or visible strain. This power allows him to alter the fundamental particles of substances, like converting rock directly into water. The Elemental Siblings' capabilities prove strategically valuable, as when Tabitha hires them to combat the Ancient Dragon threatening the academy. Under Damian's direction, the group aids the defense by helping establish a protective shield against smaller dragons.

As leader, Damian maintains a pragmatic, disciplined approach. He prioritizes missions offering financial compensation and dismisses actions driven purely by personal motives if no monetary gain exists. This mercenary mindset means the group willingly works for any paying employer, regardless of affiliation.