Finn Fish (フィン・フィッシュ)
Finn Fish is the angel, or semi-angel (jun-tenshi), who helps Maron detect demons and is also the one who transforms Maron into Kaito Jeanne. Spoilers for Manga and Anime on how the series ends: (Source: Wikipedia)
Voice Actors
Kumiko Nishihara
Japanese
Kristina von Weltzien
German