TV-Series
Description
Kouhei Izumi is a member of the Border defense organization in the anime World Trigger. He serves as the shooter for Tachikawa Squad, an A-rank unit, and holds the position of the second-highest ranked shooter in Border overall. Izumi is a seventeen-year-old male with an average build, standing at 175 cm, and he has neck-length dark blond hair and golden eyes. His blood type is B. Within the organization, his codename or nickname is often “Bullet Fool” or “Trigger Idiot,” reflecting his intense, almost obsessive fascination with trigger technology and custom bullet types.

Izumi’s personality is a blend of easygoing humor and sharp intelligence. He frequently makes jokes and maintains a laid-back attitude even during serious situations, but this casual demeanor does not undercut his strategic mind. He is adaptable in combat and quickly analyzes opponents’ fighting styles to devise effective countermeasures. Off the battlefield, he is perceptive and uses his insight to coach others, having mentored even the number-one shooter Masataka Ninomiya after being begged to do so. His motivations center on pushing the limits of what triggers and trion can do, and he takes pride in his role as a supportive yet lethal teammate.

As a shooter, Izumi engages in combat by forming trion cubes in his hand rather than using a traditional gun-type trigger. His trion reserves are exceptionally high, though not as monstrous as those of certain outliers, giving his attacks overwhelming firepower. He has achieved master class in all four standard bullet triggers: Asteroid, Viper, Hound, and Meteor. With Asteroid, he often fights in Full Attack, splitting his trion into numerous cubes to overwhelm opponents with sheer volume. His Viper control is so advanced that he is one of only three agents who can program entirely new flight paths for the bullets each time he fires, making his attacks unpredictable. He uses Hound to home in on targets and even shot down every Alektor bullet fired at him during the Galopoula invasion, a feat considered superhuman. Meteor allows him to cause widespread destruction, clearing obstacles and denying cover to enemies. Beyond these, Izumi is celebrated as the inventor of composite bullets, which combine two triggers, and he can produce Tomahawk and Gimlet in roughly two seconds each. Tomahawk blends Viper and Meteor for guided explosive blasts, while Gimlet merges Asteroid and Meteor for extreme concentrated power capable of piercing even a Rabbit’s armored arm. Defensively, he employs Shield and Full Guard with precision, and he can use Bagworm to conceal himself from radar.

Izumi typically fights alongside his Tachikawa Squad teammates, Captain Kei Tachikawa and fellow agent Takeru Yuiga. He is recognized as one of Border’s premier support agents, excelling at cornering enemies and setting up kills for his comrades. During the operation to capture Yuma Kuga’s Black Trigger, he worked with Miwa Squad and Yosuke to engage Arashiyama Squad, using feints to draw out snipers. In the large-scale Aftokrator invasion, his skills earned praise from the enemy commander Hyrein, who wished to capture him. Izumi also appears as a commentator during rank wars, offering tactical breakdowns that showcase his deep understanding of combat. While his role is primarily that of a supporting character, his technical genius and high rank make him an important figure in Border’s defenses, and his relationships highlight a mutual respect with fellow top agents and a protective, mentoring approach to those less experienced.