Kenta Yumiya is a young Blader and a central protagonist in the Beyblade: Metal Fusion series, first appearing in the very first episode where he is seen participating in a local tournament. He is a fifth-grade student who is deeply passionate about Beyblading and is characterized by his bright green hair and brown eyes. At the beginning of the story, Kenta is a novice Blader who lacks confidence in his own skills, often feeling intimidated by stronger opponents. His life changes when he is rescued from the Face Hunters, a group of bullies, by the protagonist Gingka Hagane, an encounter that ignites a powerful desire within him to become as strong as his new hero. This moment establishes his primary motivation: to grow from a timid beginner into a powerful and respected Blader.

As a person, Kenta is defined by his kindness, loyalty, and emotional sincerity. He is a caring friend who becomes deeply concerned when he senses something is wrong with those he is close to. His emotional nature is a core part of his character; he is not afraid to show his feelings, whether it is frustration at his own weakness, joy at a friend's success, or sadness when faced with a setback. Initially, his primary drive is to earn the respect and acknowledgment of his mentor, Gingka. This leads him to challenge Gingka to a duel, not out of rivalry, but from a fear that Gingka might leave him behind to face stronger opponents elsewhere. Through this battle, Kenta learns that true strength comes from the blader's spirit, a lesson that becomes the foundation for his growth.

Throughout the series, Kenta serves as a loyal companion to Gingka and a bridge between the main hero and the wider world of Bladers. He is a familiar face in the crowd, constantly cheering for his friends during major tournaments. However, his role becomes significantly more proactive as he seeks to develop his own unique abilities. With the help of their friend Madoka, he discovers hidden claws on his Beyblade, Flame Sagittario, which become the basis for his signature special move, the Sagittario Flame Claw. Kenta's path is not an easy one; he suffers devastating defeats, including a particularly brutal loss to the menacing Blader Reiji that leaves his Beyblade in pieces. These hardships, rather than breaking him, temper his resolve and earn him the respect of others.

Kenta's key relationships are central to his development. His bond with Gingka is that of a student and admiring younger brother to a powerful mentor. Madoka acts as a technical supporter, helping him understand and upgrade Flame Sagittario, while the former bully Benkei becomes an unexpected and fierce training partner. However, his most surprising and transformative relationship is with Ryuga, a powerful and initially antagonistic Blader. In the later seasons, Kenta fearlessly approaches Ryuga and joins him on a journey, determined to become stronger. This persistence pays off as he gradually earns the respect of the loner Ryuga, forging an unlikely friendship.

This relationship is the catalyst for Kenta's ultimate evolution. When Ryuga is gravely injured in a battle against the god of destruction, Nemesis, he makes the ultimate sacrifice, entrusting his power and his star fragment to Kenta. This act transforms Kenta's Beyblade, Flame Sagittario, into the immensely more powerful Flash Sagittario, granting him a new level of strength and officially elevating him to the rank of a Legendary Blader, taking Ryuga's place as the Blader of Summer. Kenta's final notable abilities reflect this growth, progressing from the horizontal slashes of the Flame Claw to the devastating vertical power of the Dive Claw and, finally, the enhanced Dive Arrow Attack with his evolved Flash Sagittario, which can switch between endurance and attack modes. From a scared boy who needed to be saved, Kenta Yumiya matures into a courageous Blader who fights alongside legends to save the world.