Gieve

A young man who arrived in Miden (the human world) in pursuit of Xeno and Lilith, both of whom had fled from Ergates—a nation of "chaotic stars" located in the Neighbor world.

He wears a Trigger on his left arm—the same type as Xeno’s—which allows him to summon various Trion soldiers into battle. He is also capable of engaging in direct combat himself, utilizing a blade similar to a Scorpion.

Accompanied by an autonomous Trion soldier named Charon, he relentlessly pursues the two escapees from Ergates.