Lucas Beaudry is a French piano prodigy who studies at the same conservatoire in Paris as Megumi Noda, known as Nodame. He is introduced as a very young student, around ten years old, and appears in the Nodame Cantabile storylines set in Paris, including Nodame Cantabile: Paris-hen, Nodame Cantabile Finale, and the related original video animation. His physical appearance includes blonde hair and blue eyes.

As a pianist, Lucas demonstrates masterful skill from an early age due to his early start in training. His playing is technically refined and leaves little to criticize. Despite his prodigious talent, he retains a youthful and joyful nature, able to find pleasure in simple things. His primary ambition is to become a conductor, and this goal motivates his studies and interactions at the Conservatoire de Paris.

In terms of personality, Lucas is friendly and approachable. He develops a good friendship with Nodame, who is older and more eccentric than he is. This friendship is significant within the Paris arc, as Lucas is one of the younger students who interacts comfortably with Nodame. Later, in the OVA set a few years after his initial appearance, Lucas is fifteen years old and develops a romantic crush on Yuiko Miyoshi, Shinichi Chiaki's cousin. This crush creates a minor romantic subplot and triggers a moment of jealousy in Chiaki.

Lucas's role in the story is that of a supporting character who embodies youthful talent and innocence. His development is marked by the passage of time from a child prodigy to an adolescent with personal feelings. He does not undergo major dramatic changes but serves as a lighthearted presence in the Parisian musical community. His notable ability is his piano proficiency, which is described as masterful for his age, and his continuing growth as a musician aiming for a conducting career.