Zaza Fruit Theories
I think its pretty likely that Zaza will have a mythical Zoan fruit, and since the last chapter I've been thinking about who is the most likely candidate to have this fruit, as I think there are a few that make sense. I'm gonna go over a couple of potential Zaza Fruit users and give points in favour and against them potentially having it. Going over them from most to least likely:
1 - Dragon
This feels like the most obvious and the one most people seem to have landed on. Since Dragon's first appearance in Logue Town he has had some degree of control over the weather, Zaza is the God of Rain. Dragon is the worlds most wanted man, Zaza is the greatest fear of the Celestial Dragons. There are definate and pretty obvious links here.
I think there are some points against this being the case. In my mind, the major one is the link between Dragon's notoriety and being the Zaza Fruit user isn't neccessary. Dragon was at God Valley, he knows the secrets of Ohara, he is the son of Garp, and he runs an organisation which directly targets the World Government, this is all enough reason for him to be the worlds most wanted man, throwing Zaza on top of that feels unnecessary.
There is also Zaza's design not being exactly fitting for Dragon. Zaza seems to have a design based off of Bedouin/Persian culture wearing a veil similar to a Burqa or Battoulah, wheras Dragon's design is explicitly based off of South American Guerrillas (specifically Che Guevara). Additionally, Zaza appears to be a woman (this could be wrong but just based off of the single panel in Chapter 1182), and Dragon is a man.
Even with these reasons against, this still feels incredibly likely to be the case.
2 - Vivi
I think there is a weirdly compelling case here. The first thing is the design, whilst Dragon has very different design inspirations than Zaza, Vivi's is incredibly similar. More than any other character, Vivi looks like Zaza. Additionally, there is the factor that, much like Luffy and Blackbeard, Imu has an obsession with Vivi and her ancient counterpart Lili. Similarly to Joyboy being the previous holder of the Nika fruit, I can see Lili being the previous holder of the Zaza fruit.
There is also a strong thematic link between Vivi and rain as a power, with the civil war in Alabasta breaking out because of the lack of rain. Vivi being the Rain God would make sense as a contrast to Crocodile being the one who stopped the rain in alabasta and started the war, with Vivi being the one who (through Luffy) brought the rain back and ended the war.
However, to address the elephant in the room, as far as we are aware, Vivi doesn't have a devil fruit. There is always the chance that she has either eaten one during the timeskip, or is still yet to eat one and will get it later in the story, but it's still a glaring hole in this theory.
I think that this is decently likely, but it would rely on either a rugpull reveal that Vivi ate one off-screen, or her eating it later on.
3 - Blackbeard
This one is a bit more left field, but still makes a lot of sense to me. Zaza has been presented as the god that he World Government fear the most, if this is the case, it is also incredibly likely that the name of the Zaza Mythical Zoan has been covered up (the same way the Nika Fruit was named the Gomu-Gomu no Mi), it is reasonable to believe that from the perspective of the World Government a Zaza Devil Fruit would be considered evil. On top of that, it is reasonable to assume that Zaza is able to counter devil fruit powers by being the rain god and having control over water.
Now this could be a reach, but both of these things go in favour of the possibility of the Zaza fruit being the Yami-Yami no Mi. The Yami-Yami no Mi is a Logia fruit dubbed "the most evil power in the world", it gives the user the ability to completely negate other devil fruit powers, but unlike every other Logia fruit does not give the user intangebility and instead makes them even more susceptible to pain. To me, this lines up with Teach's fruit not being a logia at all, and instead being a Mythical Zoan that has not yet reached awakening.
There are also the parrallels with Luffy to talk about. Luffy has a god Mythical Zoan, its likely Teach will have/get one as well. Both Luffy and Teach are considered to be equal threats by Imu, both have ties to ancient figures (Joyboy and Davy Jones), both have ties to previous powerful pirates (Roger and Rocks), both are the closest two pirates to the One Piece.
Also, this is the biggest reach imaginable but, Zehaha sounds similar to Zaza.
However, there are a lot of points against this. For the case of the Yami-Yami no Mi secretly being the Zaza fruit, Darkness and Rain are completely different. Whilst this could be seen as Teach not yet unlocking awakening and the full power of the fruit, it still seems like a large jump. And whilst Teach has more design similarities to Zaza than Dragon (he has worn very similar jewelery pre-timeskip), its still massively different with Teach's design being explicitly based off of actual historical pirates and (shockingly) the real life Blackbeard. Also, again, Teach is a man.
This would be cool, and I can see it happening, but it's not likely.
4 - Nami
I've seen Nami thrown around in discussions around this as well. In favour, Nami's entire thing is weather. She is an excellent navigator and her fighting style revolves around using and controlling weather. She is one of the main characters and her eating a devil fruit is definately something that could happen. She is also a woman, so she has more in common with Zaza design wise than either Dragon or Teach.
Other than that, I really don't buy this one. We know Nami doesn't have a Devil Fruit, and her eating one at this point feels redundant. Unlike Vivi who hasn't been a main character for 25 years, Nami has one of the main characters for the entire story. Giving her the Zaza fruit would invalidate the need for the Climatact and Zeus, it would completely change her dynamic in the crew, bumping her from being one of the weakest to one of the strongest Straw Hats, and really wouldn't fit with the whole World Government being terrified of the gods thing with her not even being on Imu's radar.
I can see the Chopper = Forest God thing, I can even see that making sense with his bounty of him being deliberately downplayed as WG propaganda, but with Nami I can't see it at all.
5 - Crocodile
I saw him mentioned, and no, not at all. I can't even think of a reason in favour other than that he stopped the rain in Alabasta, but like, his main weakness is water, why would the rain god fruit be weak to water? That would be like if Luffy's main weakness was the sun. This is the most unlikely one by a mile.
6 - The Man marked by Flames
This isn't at the bottom because its less likely than Croc, I don't think anyone is less likely than Croc. Its mainly here because we have nothing to work from. We don't know who the Man Marked by Flames is, we have no frame of reference. This could definately be the case, but there is no way to form a theory because there is no information.