Nyudo is a supporting character in the anime Puzzle & Dragons X who lives in the Dragoza region, the area where many Dragon Callers train and carry out their work. He is one of the main character Ace's friends from that region, and his central ambition is to become a Dragon Caller himself, following the same path that Ace takes. This goal is complicated by the fact that some people assume he cannot see Drops, the special spheres that a person must be able to perceive in order to become a Dragon Caller, and he is often made fun of for this perceived shortcoming.

In terms of personality, Nyudo is friendly and approachable. He also has keen observation skills, which allow him to notice details that others might miss. He is notably skilled with technology, frequently using a portable tablet to relay information and support his companions. These qualities make him a helpful presence within his group, even though he is primarily an assistant and informant rather than a fighter.

His role in the story is that of a dependable friend within Ace's circle, contributing through his technical abilities and his watchfulness while steadily working toward his dream of becoming a Dragon Caller. His most important relationship is with Ace, whom he looks up to and hopes to emulate, and he is also connected to the wider community of young people associated with the Dragon Callers in Dragoza. Throughout the series, his development revolves around his determination to pursue his aspiration and improve himself despite the doubt and teasing he faces from those who believe he cannot see Drops.