Marcus is a supporting character in the anime Thermae Romae. He is a Roman marble sculptor by trade and the closest friend of the protagonist, Lucius Modestus. Marcus is depicted as a sociable and level-headed individual, often providing a more grounded perspective compared to Lucius’s intense and obsessive nature. He is quick to try to cheer up Lucius when the architect is troubled, such as after Lucius loses his job, and he encourages him to visit the baths to relax. Unlike Lucius, who finds crowded public baths noisy and distracting, Marcus enjoys the lively atmosphere and participates in services like hair removal. As a sculptor, Marcus frequently assists Lucius by carving the decorative elements and statues for the bathhouse projects Lucius designs. His practical skills make him a reliable collaborator, and he often serves as a sounding board for Lucius’s ideas, helping to moderate the more outlandish concepts with his pragmatic advice. Marcus’s role in the story is primarily that of a supportive friend and professional ally. He helps Lucius navigate personal and professional setbacks, and his steady, sociable personality contrasts with Lucius’s more volatile temperament, allowing their friendship to function as a stabilizing force. Over the course of the story, Marcus remains a constant presence in Lucius’s life, and his most notable ability is his craftsmanship as a marble sculptor, which he applies to bring Lucius’s architectural visions to life.