Niberune

Niberune (voiced by Yuki Tanaka in Japanese and Megan Shipman in English) is a mysterious young girl introduced in the anime adaptation of I Left My A-Rank Party to Help My Former Students Reach the Dungeon Depths!.

She is discovered by the Clover party (led by Yuke) in a dungeon (specifically noted in Duna/Twilight city contexts), initially found unconscious or in a vulnerable state. Niberune harbors a connection to the "Golden Priestess" a fragment or remnant of this deceased/ancient priestess possesses her briefly, delivering important (and dire) warnings or revelations that tie into larger threats only Clover can address. After the possession ends, she collapses and later awakens as herself, explaining the entity was a temporary fragment within her.

She is a small, petite girl who starts off very shy but reveals a joyful, childlike personality underneath. Eventually, she joins Clover as an official (or ward-like) member, becoming part of the group dynamic often looked after by the others (like Marina and Nene, with Nene being stricter about her care). Her presence adds a layer of mystery and supernatural elements to the party's adventures.