Who will be the 3rd playable character?

Being playable on Curse of the Moon surely made him a big candidate, as a replacement of Sypha on Castlevania 3. Considering his first reveal up to now, he surely grew as a character, for the little we know him, and his graphics on the game shows that he has more or less the same usual size of a playable character. I consider Alfred to be a good option and wouldn't be too surprising if it was him, filling up the caster role, after all, the playable character must be something different than the two ones we already know.

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I believe it is very unlikely that Anne will be a playable character. She doesn't seem to have any kind of battle power and her parents were killed by demons. If she knew how to fight, she would have protected them, unless there is a very secret plot behind her (for instance, she is a Shardbinder that also didn't die and her powers were doormant, or something like that), even so, she would be too close to Maria of Castlevania, and that wouldn't be good.

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Bloodless was just a boss at the 2017 Demo but grew on popularity between players. With a unique design, like a sexy baroness, i believe she was crafted to be playable at the Boss Revenge Mode. I'm pretty sure not all bosses will be playable there (how you would play with Vepar or Valac?) so, they needed to create some "human-sized bosses" in order to fill in the promised Boss Revenge and Bloodless fits that perfectly. Putting her as the third playable character would be missing that opportunity.

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Gebel is a candidate for being a third playable character. He also showed up on Curse of the Moon, he is close to Alucard in looks and powers and would fit greatly for a unique gameplay. The only reason i'm not completely convinced it could be him is because, depending on how we will fight against him, he may be playable at the Boss Revenge Mode, filling up the same situation i explained for Bloodless.

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I don't think anyone really believes IGA would be playable. He wouldn't do that, it would made him look like a as a weirdo and we don't know how it will be IGA BOSS anyways.

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Johannes is a mystery. At first, he was just filling the role of the smart guy, became the alchemist to craft stuff for us and his role grew and grew overtime. It's hard to tell what Johannes real purpose in the whole game is by now. He doesn't have a really interesting design and Dominique flat out said he don't have any battle experience or training, that would rule him out as being a playable character. But...who knows. 

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Being the highest candidate so far, thanks to hs looks being closer to Alucard and people believing he will be Alucard's dub cameo, there is a possibility he could be playable. The main reason for this, i think, is that it was stated that people wouldn't guess it easily and he was shown only at a mysterious frame and at a 2 second scene on a trailer and we know nothing about him.

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Highly unlikely, considering Pure Miriam is a skin and Cursed Miriam may be just a plot point.

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There are other characters we don't know yet, including the villagers and people we weren't presented yet and considering it was stated that it would be hard to guess, they are all possible candidates, mostly because we know almost nothing about them.

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Dominique Baldwin was revealed alongside Alfred and Anne. With a strikingly beautiful design, she said she "knows a thing or two" about expelling demons (although she was almost killed by a Morte). When she claims Johannes doesn't have battle training, she didn't inclued herself. She is a member of the church, that seems to be a force at the game's plot, considering they are even gathering Shard to purify them (or so it seems). With very long hair that would float around as she walks (that is important for a character to be easily seen while playing), i believe she has all requirements to be the third playable character. That's why I CONSIDER SHE WILL BE and she is my personal option.

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PS: Didn't considered Shovel Armor because he was officially ruled out by Question

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EDIT: posted before seeing Angel-Corlux's post, who just CRUSHED almost everything i said!