Eltzen is a supporting character from the dark fantasy anime Übel Blatt. He is a male companion who accompanies Elseria Rahnclave on her adventures. Physically, Eltzen is depicted as an elegant young man who wears glasses, a visual trait that complements his role as the strategic thinker of the group. His demeanor is refined and courteous, often addressing Elseria as Milady, which gives him the air of a knight sworn to protect her. This chivalrous attitude stems from his background; he originally served the Rahnclave family and has known Elseria since her birth, retaining vivid memories of her growth and past events.

In terms of personality, Eltzen is defined by his deep curiosity, specifically regarding the power and existence of fairies. This interest can sometimes lead him to act impulsively when encountering phenomena related to them. Despite this occasional eagerness, he is highly competent and serves as the brain of the party, demonstrating a notable talent for manipulating magical rituals and formulas. His extensive knowledge and experience make him a crucial asset to the team, and his presence is said to add significant depth to the unfolding story. His primary motivation appears to be a blend of intellectual curiosity about the mystical elements of his world and a steadfast loyalty to the Rahnclave family, particularly to Elseria, whom he is determined to support and protect. Key relationships are centered on this dynamic, with his interactions and dialogue often highlighting his role as her advisor and guardian. While information about a distinct character arc or developmental changes throughout the series is not available, his established background as a longtime retainer and a knowledgeable mage positions him as a foundational source of stability and insight for his companions. His notable abilities lie in his intellect and mastery of magical rites, which he employs skillfully to overcome challenges faced by the group.