Jenta Kokuji is a character from the anime B-Daman Fireblast, known as a former antagonist who initially serves as the Northern B-Master of Crestland. His past is marked by a significant period of brainwashing at the hands of another character, Ryoma Godai, under whose influence he acts against his true nature. Before this manipulation, Jenta shared a close friendship with Bakuga Shira, a connection that becomes a crucial part of his personal story.

In terms of appearance, Jenta is depicted with a large, muscular build that reflects his dedication to physical conditioning. He has green eyes and shaggy, violet hair accented by a distinctive orange highlight. His clothing consists of multiple layers, including a dark green tee over a black short-sleeved undershirt, with a yellow shirt beneath those. He also wears orange camouflage pattern pants held by a black and orange belt with a silver buckle, and completes his look with purple and white sneakers.

Jenta's personality is defined by an intense drive to push himself beyond his limits, making him something of a try-hard who clearly enjoys rigorous exercise, as shown by his debut in a fitness room. He often adopts a stern and serious demeanor, especially during battles or when interacting with others. A notable verbal tic is his frequent use of the word Roger, which he says in acknowledgment of another person or an order. His B-Daman, Dashing Tankshell, even refers to him with a Boss moniker.

His primary motivation stems from his past friendship with Bakuga Shira. After being brainwashed, reports of Bakugas location cause him visible distress, and he actively seeks out his former friend, leading to a Road Fight between them. This battle and his subsequent encounters are driven by the complex remnants of their relationship and his manipulated state. Ultimately, his path leads him into conflict with Kamon Day, whom he battles multiple times. After initially earning a draw, Jenta suffers a loss to Kamon, which breaks the brainwashing placed upon him by Ryoma Godai.

Jentas most significant relationship is with Bakuga Shira, his close friend before his corruption. Their confrontation as the Northern and Western B-Masters is a pivotal moment. He also has a key rivalry with the protagonist Kamon Day; their repeated battles serve as the catalyst for his redemption and defeat. He reports directly to Ryoma Godai while under his control, and also takes orders from his own father.

His development is central to his role, as he transforms from a brainwashed antagonist serving the Grand B-Master into a defeated adversary freed from that control. This change occurs directly as a result of his loss to Kamon Day, which breaks the brainwashing and ends his tenure as a villain. His initial character arc focuses on the struggle between his manipulated mission and his buried past loyalties.

Jenta is known for his powerful abilities with his B-Daman, Dashing Tankshell, which is based on the Black Tortoise of the North. He is capable of performing powerful Emblem Charge attacks, including Storm Dark Inferno, a burst of rapid-fire that can knock down multiple targets. When he equips a Dash Stabilizer to his B-Daman, forming Dash Dashing Tankshell, he can unleash an even more formidable attack known as Infinite Dark Inferno. These abilities highlight his skill as a powerful B-Master who relies on brute force and rapid shooting techniques.