General Trivia

• Acting for Two: In the movie, Koji Yusa voices not only Renzou but also Juuzou and Kinzou.
• B-Team Sequel: The third season was animated at Studio VOLN.
• Cross-Dressing Voices: Played straight in the English dub where Konekomaru Miwa, Nemu Takada and Karura are voiced by Mona Marshall, Brianne Siddall, and Kari Wahlgren respectively, but averted in the original Japanese version where they are voiced by Yūki Kaji, Tsubasa Yonaga, and Ayumu Murase.
• The Other Darrin:
  • Since the second season, Hiroaki Hirata voices Father Shirou Fujimoto instead of the late Keiji Fujiwara.
  • Katsuyuki Konishi plays Juuzou while Kissho Taniyama plays Kinzou. Notably, Juuzou and Kinzou were previously played by Koji Yusa.
  • In the English version, Shiemi's mom goes from being voiced by Mari Devon to Dorah Fine following Devon's retirement.
  • In the dub, young Bon was voiced by Philece Sampler in the first two seasons. Due to Sampler's passing in 2021, he is now voiced by an unknown actor.
  • Tatsuma was initially voiced by Michael McConnohie. Due to McConnohie's retirement, a new voice took over.
• Overtook the Manga: At the time the anime aired, only 30+ chapters of the manga were even out.
• Recast as a Regular: Brian Beacock and Darrel Guilbeau first voiced two of Reiji Shiratori’s friends before their respective characters, Shima and Amaimon appeared.
• Role Reprise: A majority of the cast in both languages return to reprise their roles.
• Series Hiatus: On July 2021, Kazue Kato announced on her Twitter account that she's putting the series on an eight-month hiatus so she can work on the manga adaptation of Fuyumi Ono's Eizen Karukaya Kaiitan. Earlier in that year, the manga was also put on a two-month break because she got exhausted.
• What Could Have Been:
  • The prototype for Blue Exorcist is in the anthology Time Killers, under the name The Miyama-Uguisu Mansion Incident. There are some similarities between the two, the most obvious being the demon concept.
  • Imagine Rin being The Gunslinger and Yukio being the Blue Exorcist! Kato-sensei originally planned for that to happen.
  • Shiemi's original concept was more gothic in design, dressed in Elegant Gothic Lolita and lived in a black tower.
  • Concept art shows that Takara was originally going to be a girl (and Word of God confirms in the character book), and there are two other characters that were cut from the cast. Also, the not-quite-final designs of the character are slightly different and hint at somewhat changed personalities.