So Castlevania is out and the reviews have been very positive (you can read mine here). season two has already been greenlit, and it's expected to contain twice the amount of episodes. Beyond that producer Adi Shankar has stated that he plans to take things even further. Speaking to polygon Shankar had this to say:
“Ultimately the way I look at Castlevania is as a story about a family and multiple generations of this family. ...There are aspects from all the games that I have plans to include, assuming the audience still keeps showing up. I would love to continue this series and I would love to keep making seasons, keep telling stories in this universe.”
So while we know season 2 will finish out the story of Castlevania III: Dracula's Curse, the question is where can they go after that? There are a few options which I will lay out here in order of likelihood.
The Continued Adventures Of Alucard
Unsurprisingly, the most likely candidate is probably Castlevania: Symphony of the Night, for several reasons. First and foremost it is the most popular game in the series, counted among virtually every best games list that has been published, regularly making it into the top 10.
It has one of the more intricate plots in the series, featuring multiple secret story elements and endings. It also continues the story of Alucard, who appeared in season 1. And perhaps most importantly, it is the favorite game of series producer Adi Shankar. But I really feel that going straight to Symphony for season 3 would waste some of its potential.
An interesting aspect of much of the Castlevania canon is that the stories tend to cluster close to each other on the timeline. So while the entire story spans nearly a thousand years, many of the games take place within 10 to 15 years of each other. But part of Symphony's unique charm is that it is actually a direct sequel to two separate games in the canon; games with stories separated by centuries.
This is possible because Alucard is half vampire and therefore immortal. As you probably know Alucard was in Cv3, but Symphony is also a sequel to the 1993 game, Castlevania: Rondo of Blood, which took place just five years before the events of Alucard's 2nd adventure.
I think a two season arc encompassing the two games would be the best way to go. Eight episodes each, and not necessarily one game per season. I could see Rondo going for five or six episodes before jumping into SoTN to give the game with heavier story elements more room to breath.
It's also the best shot we have at seeing something like this again...
Simon Belmont's Story
The second most likely option has to be the tale(s) of Simon Belmont. The original protagonist of the series, and the star of the most games. All in all he leads six of them, and appears in three others. He is the most widely known member of the Belmont clan, and considered by many to be the greatest. While the majority of his games are a retelling of the story from the original Castlevania, Castlevania II: Simon's Quest was a true sequel that took his narrative to interesting places.
Now even with those two separate stories Simon's overall plotline is pretty slim, so I'm not sure if he could carry more than a single eight episode season, which would be fine. However, if the series wanted to spend time really digging into the mythology and ways of the Belmonts, he's a great choice of character to do that with.
There is also another way to go altogether, one which could be utilized as early as season three, or easily in a much later season. It's also entirely possible that it is disregarded completely. We could go backwards, to the beginning of the Castevania story in Castlevania: Lament of Innocence.
Set during the first crusades, it's abounding with potential for the type of medieval fantasy many enjoyed in season 1. It tells the story of how the Belmonts came to hunt creatures of the night, how Dracula came to power, and most importantly how these two things are eternally intertwined. I could imagine a half season of build up set in the Crusades, developing Leon and Mathias' relationship.
It would also allow for a starkly different story than the previous seasons. Dracula is not the antagonist, and at the start Leon Belmont has never hunted a monster in his life. He is, however, a celebrated knight who has never lost a battle. And while I doubt this is where they'd go for season three, it is a possible option down the line to help break up the repetitiveness of some of the other tales.
Another option for a season down the line, for some of the same reasons as Lament, and Symphony, and given the parallels is has to Cv3, is the combination of Castlevania: Aria of Sorrow, and Castlevania: Dawn of Sorrow. Another two-parter in the saga, and its ultimate ending. These are only games in the original series that take place in the future, set in the years 2035 and 2036 respectively, telling the story of Soma Cruz, a Japanese high school student who is much more than he appears to be.
A big part of these games' favor is the inclusion of character Genya Arikado, who is very obviously but “secretly” Alucard. It also features a descendant of the Belnades line that Sypha from season 1 belongs to, as well as the man who finally ended Dracula for good, Julius Belmont. Like Lament, it is a very different story than most of the games, as Dracula does not appear as an antagonist, and it is the only game not set in the past. It's something that probably should be saved for a much later, possibly final season. But they are also some of the favorite games of Adi Shankar.
It could also potentially provide us with the 1999 story Castlevania fans have been waiting on for over a decade.
The Next Chapter
Strangely enough, the least likely but still possible era of the games we're likely to move on to is actually the next part of the story chronologically following the events of seasons 1 and 2. Those being the events of the PlayStation 2 game Castlevania: Curse of Darkness which takes place just three years later, followed by the GameBoy games Castlevania: The Adventur and Castlevania 2: Belmont's Revenge, which follow the Belmont clan a full century after Trevor. Strangely enough, both of these storylines have previously been adapted into other media.
Now unlike the other entries on this list, I do not group these three all together because they could fit into one cohesive narrative. While yes the GameBoy games do tell a cohesive story, Curse is a direct follow up to Cv3. I don't have much hope that they'll be adapted, but depending on your view of the game series either one could be considered the true follow up to Cv3, the game adapted into the story of seasons 1 and 2.
While Curse of Darkness, which was previously adapted into a manga, has influenced the show already, mainly in Trevor's character design, I doubt we'll see much more than passing references to its story in season 2. And without the presence of characters and events during the time of these seasons, a future season on this game would make no sense.
With the GameBoy games, which have already been adapted into a graphic novel, there is even more potential for developing the Belmont family than with Simon, given that it is the story of a father and son. But it is incredibly light on story, mostly due to the console it released on.
So that's about it.There are certainly more Castlevania games than those listed here, but these are really the only ones we might expect to see adapted into seasons of the animated series, at least for the foreseeable future. But who knows: If season 2 continues to impress, and the audience continues to expand, we might end up with an animated timeline as long and intricate as the games themselves. That is certainly what I'm hoping for anyway.