Many people actually believe she’s a Kuja, and I admit, they have pretty good reasons for thinking so. Let’s start by her name: other than being a card game, Black Maria is also a variety of bougainvillea, a clear reference to Kuja’s floral naming theme; there is also a flower named Spider Lily (Lycoris radiata) referencing her Devil Fruit powers and Amazon Lily alike. Black Maria has also flowers in her hair; the most prominent ones, colored in red, have also five petals, much like the one Gloriosa wears in her hair!
She is also the owner of a brothel in Onigashima and, also due to her size, it’s heavily implied that she and Kaido have a… passionate relationship, as Oda would put it (However, Kaido probably views her as nothing more than a distraction). Of course, Kaido and his wife must have had their passionate moments, since they have a child.
Moreover, Benzaiten is almost always represented playing a biwa, and, as shown in chapter 992, Black Maria can play it very well. She also has a remarkable singing voice, a feature which was one of the basic requisites to become a geisha. Geishas also were protected by Benzaiten. All in all, Black Maria is actually the biggest reference to Gloriosa… in a literal and figurative sense!
Oh, one last thing: the men tied to her webs in Chapter 1005 can be a symbol for Kaido’s soul, unable to move on and perpetually being trapped in the memories and regrets of his relationship with Gloriosa together with his alcohol addiction.
Currently, Kaido’s flagship is the only one among the four Emperors’ which has yet to be seen or named. Some speculate that it’s actually Onigashima, but, in my opinion, that’s not the case: why would he travel with his entire home, with the concrete risk of it being destroyed every time he faces an opponent? Also, Yamato is in there: they have explosive handcuffs which doesn’t allow them to leave the island, but what if someone with internal destruction haki actually removes them thus freeing Yamato and letting them escape? Also, what if Yamato actually gets severely wounded, or worse, killed by invaders?
Kaido actually strikes me as an overprotective dad, thus he will never directly expose his child to external danger. The handcuffs will explode if and only if Yamato actually tries to leave Onigashima: if they stay there, nothing will happen.
Plus, in chapter 997, when Kaido started lifting Onigashima someone said that the island had never trembled like that before.
Kaido actually has his flagship, and the reason why it hasn’t been shown is its name. I’ve said before that Gloriosa means glorious in some languages, therefore there’s a big chance that the ship will have in its name also the Japanese word of the same meaning. Maybe it’s called ‘Glorious Dragon’ in Japanese, or something like that.
Now, this will touch one of the most controversial topics within the community right now, which is Yamato’s gender; I wish not to discuss about it under this post, because this isn’t the time nor the place (IMO it’s better to delay the discussion at the end of this arc, when Yamato will hopefully detach from the Kozuki Oden persona and find their own identity). Regardless of all this, Yamato was born as a female: and Kujas give birth to female babies only.
Kaido and Big Mom comparison
Although they were part of the same pirate crew for some time and both of them being now Emperors, there are a lot of things about their characters which mark these two as counterparts: first of all, Kaido is male and Big Mom is female. Big Mom belongs to the older generations of pirates, while Kaido belongs to the new one (together with Shanks). Kaido drinks a lot while Big Mom eats a lot. Big Mom has more than 80 children, while Kaido just one*.
Lastly, Big Mom has had many unknown husbands, who she married and treated as equals only to discard them when their children are born, revealing she had zero feelings towards them. With the previous comparisons in mind, it would make perfect sense for Kaido to have had only one wife who has already appeared in the story and who he has loved dearly
and maybe still does.
*In my opinion, Katakuri, Oven and Daifuku aren’t Kaido’s sons. Even if the physical resemblance is uncanny, there are two major arguments against this supposed paternity: first, the triplets don’t display any type of horns, which Yamato, the known child of Kaido, has. Secondly, the Yonko’s age: he is surely younger than 68, since this is Big Mom’s age and she considers him like a little brother; however, being heavily implied that Shakuyaku was part of the Rocks Pirates as well and she was considered a pirate, while Kaido was only an apprentice, it’s implicitly stated that he must be younger than her, too. She’s now 64, and this puts his maximum age at 63; given the triplet’s age, 48, Kaido may have had them when he was 15, which is an age when men usually have reached their sexual maturity, but he may be even younger than that, so draw your conclusion.
I admit, this turned out a lot longer than I actually expected. My sincerest kudos to you, dear reader, for reading all this time-consuming post – I hope you enjoyed it as much as I had fun writing it.
Please, let me know your thoughts, they are more than welcome!
*Theory by Eprepti