Dryden Fassa appears in Escaflowne: The Movie as a character with a comparatively small but meaningful role, distinct from his more prominent presence in the television series. He is portrayed as a wealthy and knowledgeable merchant, the scion of a powerful merchant family from the city of Torushina. In the film's world, he serves as a financial backer and supporter of the Abaharaki, a rebel group fighting against the Black Dragon Clan and the empire of Zaibach.

His personality is marked by a calm, pragmatic, and well-informed demeanor. Background information suggests he is well-educated, and his intelligence is demonstrated through his deep understanding of ancient Gaean lore and prophecy. He is a generous individual who uses his resources to support a cause he believes in, a trait consistent with his character across different interpretations. In his meetings with Hitomi and the other protagonists, he speaks with a sense of gravity and knowledge, acting as an explainer of complex mystical concepts.

Dryden's primary motivation in the movie is tied to the larger conflict against Zaibach. He provides the logistical and financial foundation for the resistance, hoping to turn the tide of the war. His role in the story is crucial at a specific juncture: when Hitomi and Van return to Torushina, it is Dryden who clarifies the stakes of Hitomi's position as the Wing Goddess. He reveals the full, two-part nature of the ancient prophecy, explaining that she has the power to either save the world or bring about its destruction. This revelation is a key moment that deepens the film's central conflict.

In terms of key relationships, Dryden is allied with the Abaharaki, which includes significant characters such as Allen and Millerna. While the romantic and betrothal subplots from the television series are not a focal point in the movie, his role as a benefactor links him directly to their cause. His development is not a central arc of the film, as his function is more to provide critical exposition and support for the protagonists. He appears as a stable, well-informed figure who helps guide the main characters' understanding of their situation. Regarding notable abilities, Dryden does not engage in combat or pilot a guymelef. His primary strengths lie in his vast wealth, his business acumen, and his scholarly knowledge of Gaea's ancient history and prophecies, which he uses to assist the heroes.