Hiro is a chubby boy with spiky hair. At 189 cm, he is one of the tallest Border agents shown so far.
Hiro is an emotional boy; he is shown to be prone to crying and panicking. Despite that, when cornered by Ninomiya, he was calm enough to accept his imminent defeat and unload a few supporting shots towards Kageura's location.
He is known for haphazardly bombarding the battlefield with grenade-like Meteors.
Though initially not liking each other very much, Kitazoe and Kageura came to a mutual understanding by fighting in solo battles. They are on good terms with each other, although Kageura can become impatient with Kitazoe's shows of emotion.
- His gun trigger is based on a MGL-140 Grenade Launcher.
- He likes strawberries, spring rolls, rice-with-toppings (donmono), and mahjong.
- He fought with Kageura one-on-one for 8 times before they acknowledged each other.
- He is the 2nd tallest border agent after Reiji.