* AuthorExistenceFailure: Sunao Yoshida died at the age of 34, with the novel series incomplete and the manga adaptation not even begun yet. His best friend Kentaro Yasui took over on both. Nobody bothered to take over the anime, which ended with a 1st-season cliffhanger, though. The manga is still ongoing though.
* NamesToKnowInAnime:
** Abel is Creator/HirokiTochi
** Esther is Creator/MamikoNoto
** Tres is Creator/KazuyaNakai
** Fr. Vaclav is Creator/FumihikoTachiki
** Sis. Kate is Creator/HitomiNabatame
** Cain is Creator/JunichiSuwabe
** Ion is Creator/JunkoMinagawa
** Fr. Francisco is Creator/JurotaKosugi
** Radu is Creator/KatsuyukiKonishi
** Isaak is Creator/KeijiFujiwara
** Dietrich is Creator/KenichiSuzumura
** Asta is Creator/MichikoNeya
** Sis. Noelle is Creator/SayakaOhara
** Lady Caterina is Creator/TakakoHonda
** Bro. Petros is Creator/TetsuInada
** Fr. William is Creator/ToruOkawa
** Empress Seth is YukiMatsuoka
** Sis. Paula is YukoKaida
* In the English Dub:
** Father Abel is Creator/TroyBaker
** Ion is Creator/AaronDismuke
** Astharoshe is Creator/CarrieSavage
** Empress Seth is Creator/HilaryHaag
** Father Tres is Creator/ChristopherSabat
** Pope Alessandro is Creator/GregAyres
** Sister Esther is Creator/ColleenClinkenbeard
** Virgil is Creator/VicMignogna
** Wendy is Creator/CaitlinGlass
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