Emrys Geijer Fremevilla is a supporting character in the series. He is the second prince of the Fremmevilla Kingdom and is of adult age, identifiable by his long orange hair that reaches his waist and his blue eyes.

In his role as a prince, Emrys is a capable pilot of Silhouette Knights, the giant magical mecha that form the centerpiece of the world's combat. His personal Silhouette Knight is named Goldleo, a machine that he operates in battle to defend his kingdom. He demonstrates his combat prowess by using Goldleo's powerful special attack, known as Blast Howling, a technique that unleashes a devastating blast of energy in the midst of a fight.

Emrys's key relationships are defined by his royal status and his position as an ally to the protagonist. He is the uncle of the main character, Ernesti Echevalier, a connection that places him firmly in support of Ernesti's endeavors. He is also listed as an ally to other main characters such as Batson Termonen and Olver Bromdal, aligning him with the primary heroic faction of the story, the Silver Phoenix Knights. His motivations are driven by a sense of duty and family loyalty. When the powerful Kingdom of Jaroudek declares war on the Kingdom of Kusheperka, a neighboring nation, Emrys personally intervenes in the conflict. His goal is not primarily political conquest but a rescue mission, as he jumps into the heart of the war zone specifically to save his aunt, a familial tie that underscores his personal bravery and care for his family.

The available information on Emrys does not provide details on his background before the events of the story, his internal personality traits, any specific character development he undergoes, or a comprehensive list of his notable abilities beyond the operation of his Silhouette Knight and its signature attack. His exact rank or official role within the kingdom's military hierarchy is also not specified.