Blue Exorcist Season 3: Will It Ever Happen?
Patience may be a virtue, but it's also a shared trait among Blue Exorcist fans. There was actually a long period between Blue Exorcist seasons 1 and 2. After season 1, fans waited five years for 2017's "Kyoto Saga." As Screen Rant notes, it's because of this long wait between the first two seasons why there's a sliver of hope for a season 3. The next anime installment of Blue Exorcist coming in 2022 or even 2023 would not be too out of place for the series.
Another reason there could be a season 3 on the horizon is the sales of the manga. Via Crunchyroll, by 2016, the manga had surpassed 15 million sold copies. And as this Anime News Network article noted, when the Blue Exorcist anime series first premiered, it significantly boosted manga and novel sales of the series. A new season could do the same boost in sales now for the manga, which is still ongoing.
Speaking of the manga, the anime series has plenty of stories the next season could pull from. As The Cinemaholic noted, the anime series has already followed the major manga story points in the first volumes. So season 3 would likely start pulling from manga volumes 10 and 11. It's here that a follow-up to the "Kyoto Saga" begins and details Rin's battle against Lucifer the King of Light and his Illuminati group.