Main protagonist nicknamed the "Ace of Games". Son of Gao Mikado, the legendary Buddyfighter. Yuga is a fun-loving boy who is sometimes reckless. He is highly intuitive and is a quick learner. His buddy is Gargantua Dragon.

One of the protagonists, known as the "known as the Ace of Studies". A national top-scorer. He is always in the library and is hard to approach. He recognizes Yuga as his rival in Buddyfight. His buddy is Skyseer Dragon, Cross Astrologia.

Known as the "Ace of Sports" who excels in all kinds of sports. He is an outgoing person who values camaraderie and has a strong sense of justice. A powerful Buddyfighter. His buddy is Thunder Axe Agito.

Yuga's good friend. Ranma helps Yuga with their video blog and his stunts. He is good with machines and is well-versed in Buddyfight. As his parents are often away, he frequents Yuga's home. He disappeared after the ABC Cup.

Garga is the Deity of Combat. "Gargantua Punisher" is an ability he wields since ancient times. His personality and behavior is that of a warrior. He hates whining and trains hard everyday to become stronger. However, he loses himself before good food.

A dragon who predicts the future with astrology. Level-headed and is good at taking care of others. He is always observing Subaru and conscious about his feelings, but is careful not to let Subaru find out.

Masato's partner and leader of the Linkdragon Order. He is extremely passionate and always greatly supports Masato with his members.