Cinnamonstick

Kaiba's stoic head of security and personal assistant, who oversees Yumika's integration into the Kaiba household.

Yumika's younger sister by two years. She is often oblivious to Jinwoo's subtle attempts to connect with Yumika but occasionally serves as an unwitting wingman.

A seasoned C-rank Hunter who often acts as a leader or mentor figure in lower-ranked raids. His experience will be crucial, though perhaps insufficient, when the group encounters the double dungeon.

A charismatic rogue thief who specializes in supernatural antiquities. He is the prime suspect in the artifact's disappearance, but may know more about the true threat than he lets on.