|“||Shall I level this area with my Meteor?||”|
–Izumi, to Miwa, 
Izumi is a boy of average height. He has neck-length dark blond hair, and also golden eyes. When he is in trigger mode, Izumi wears a black long coat with thin red stripes on it and a Border emblem patch on his left sleeve, just like the rest of his unit.
As shown in the manga, Izumi is a reckless person. He wanted to raze the whole battlefield with Meteor in just to lure Arashiyama Unit out. Tōma also said that Izumi always comes up with harsh ideas. However, this personality doesn't always show up, and he is actually quite intelligent and a good strategist. Izumi is a humorous person, often making jokes whether it be casual or in battles. He is slightly immature when he is around his friends.
- He likes fried prawns, croquettes, oranges, and using Full-Attack.
- He is the one who discovered the composite bullets.
- In Japanese, his name "Izumi" means "flood" and "Kouhei" means "justice"
- He ranked fifth in the 1st Valentine's Day Ranking and first in the 2nd Valentine's Day Ranking.