TV-Series
Description
Osamu Mikumo is a 15-year-old human male with black hair, green eyes, and light skin, typically seen wearing glasses. His enlistment in Border began with a promise to protect friend Chika Amatori, honoring an obligation to her missing brother Rinji. After Border rejected his application, he attempted to infiltrate their facility but was attacked by a Trion Soldier and rescued by Yūichi Jin. This incident secured his entry as a C-rank agent, later promoted to B-rank.
He demonstrates a strong sense of justice and unwavering determination, consistently prioritizing others' safety over his own. Acknowledging his combat limitations, he refuses to compromise his principles, believing avoiding responsibility once would lead to habitual avoidance during critical moments. His honesty registers clearly to lie-detection abilities. Following advice to strengthen his team rather than solely address personal weaknesses, his leadership evolved, enabling unconventional strategies like recruiting Jin and negotiating with former adversaries. Personality assessments classify him as ENFJ and Enneagram 6w5, reflecting loyalty, pressure-induced anxiety, and strategic creativity that inform his cautious yet innovative battle tactics.
Outside missions, he wears standard Japanese high school attire. His C-rank Border uniform is an all-white suit with yellow-striped sleeves and shoulder emblems. His B-rank attire features a blue jacket with a black-and-white striped left sleeve, Tamakoma Branch shoulder guard, and squad emblem on the chest.
As a Shooter and captain of Tamakoma Second, he utilizes Triggers compensating for low Trion energy. His arsenal includes:
- Raygust: A sword-shield hybrid deployed defensively, often enhanced with Thruster for propulsion or amplified shield momentum using Chika’s Trion.
- Asteroid: Standard projectile bullets effective at close-mid range.
- Spider: Wire-based traps for battlefield control and psychological disruption.
- Bagworm: Radar-jamming stealth utility.
His combat style emphasizes meticulous preparation and tactical innovation over physical prowess, leveraging Spider wires to create advantages despite low Trion reserves. This approach earned him elite-agent recognition for "ruthless" opportunism.
Development arcs through key conflicts: During a school Marmod attack, his ineffective defense required Yūma Kuga’s intervention, exposing inadequate combat skills. He later formed Tamakoma Second with Yūma and Chika, accepting leadership despite self-doubt. In the Large-Scale Invasion, he coordinated civilians and trainees against Rabbit-class Trion Soldiers while supporting Kitora’s evacuation. Strategic adaptability emerged when he channeled Chika’s Trion to amplify Thruster, destroying multiple Rabbits. Subsequent growth involved refining team tactics, employing psychological manipulation learned from Eizō Netsuki in negotiations, and integrating former enemies like Hyuse into his squad.
Personal trivia includes left-handedness, a preference for homemade cream croquettes, and anxiety-induced chest discomfort during stress. The kanji "修" in his name translates to "discipline," reflecting his persistent self-improvement.
He demonstrates a strong sense of justice and unwavering determination, consistently prioritizing others' safety over his own. Acknowledging his combat limitations, he refuses to compromise his principles, believing avoiding responsibility once would lead to habitual avoidance during critical moments. His honesty registers clearly to lie-detection abilities. Following advice to strengthen his team rather than solely address personal weaknesses, his leadership evolved, enabling unconventional strategies like recruiting Jin and negotiating with former adversaries. Personality assessments classify him as ENFJ and Enneagram 6w5, reflecting loyalty, pressure-induced anxiety, and strategic creativity that inform his cautious yet innovative battle tactics.
Outside missions, he wears standard Japanese high school attire. His C-rank Border uniform is an all-white suit with yellow-striped sleeves and shoulder emblems. His B-rank attire features a blue jacket with a black-and-white striped left sleeve, Tamakoma Branch shoulder guard, and squad emblem on the chest.
As a Shooter and captain of Tamakoma Second, he utilizes Triggers compensating for low Trion energy. His arsenal includes:
- Raygust: A sword-shield hybrid deployed defensively, often enhanced with Thruster for propulsion or amplified shield momentum using Chika’s Trion.
- Asteroid: Standard projectile bullets effective at close-mid range.
- Spider: Wire-based traps for battlefield control and psychological disruption.
- Bagworm: Radar-jamming stealth utility.
His combat style emphasizes meticulous preparation and tactical innovation over physical prowess, leveraging Spider wires to create advantages despite low Trion reserves. This approach earned him elite-agent recognition for "ruthless" opportunism.
Development arcs through key conflicts: During a school Marmod attack, his ineffective defense required Yūma Kuga’s intervention, exposing inadequate combat skills. He later formed Tamakoma Second with Yūma and Chika, accepting leadership despite self-doubt. In the Large-Scale Invasion, he coordinated civilians and trainees against Rabbit-class Trion Soldiers while supporting Kitora’s evacuation. Strategic adaptability emerged when he channeled Chika’s Trion to amplify Thruster, destroying multiple Rabbits. Subsequent growth involved refining team tactics, employing psychological manipulation learned from Eizō Netsuki in negotiations, and integrating former enemies like Hyuse into his squad.
Personal trivia includes left-handedness, a preference for homemade cream croquettes, and anxiety-induced chest discomfort during stress. The kanji "修" in his name translates to "discipline," reflecting his persistent self-improvement.