It's a stretch but I'm calling it now.

Master of Masters is Prompto from final fantasy 15. If not Directly atleast indirectly. MoM could be an alternative version of Prompto. Whatever the case Prompto either is MoM or his versus 16(or verum rex) counter-part would have been. Prompto being the Masters of Masters is quite the strech, but at the bottom of this is my 2nd "way more tangible guess"

The one thing i still cant surmise is if Prompto/MoM is going to be evil or good.---->

The only thing ill say on how i surmised the two things at the top is, I believe there is alot more "deceitful switching"

Yeah its currently written as 'fact' that final fastasy 15/versus 16/verum rex are seperate identity. But developers often lie or strecth the truth as far as possible(wink) to deter people from guessing the whole plot. Like when Nomura recently said verum rex is not versus 16, it could be final fantasy 15. Making Yazora the nobody of Noctis. Yazora could be the direct 'real-world' nobody of noctis, or a nobody version of him in his sleep world/or of the world Noctis has the power to 'visit' through his dreams.

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In Chapter 11, the "Prompto" who fights alongside Noctis is Ardyn in disguise, as revealed at the end of the chapter. He says lines Prompto has never uttered before (including when using his Techniques), and moves slightly differently, the way he stands up and his swagger walk being the most noticeable. Similarly, the "Ardyn" Noctis pursues on the train behaves in a way unlike how Ardyn normally acts, such as saying "dude, are you seriously trying to kill me", wondering what is happening and panicking when Noctis chases him in anger. In Episode Prompto Prompto remembers Noctis pinning him against a wall by his throat, which is how Noctis confronted "Ardyn" in this scene.

How much Prompto is initially aware of his origins is ambiguous. Episode Prompto loading screens call his Insomnian parents his adoptive parents, but the Comrades character profile and the dossiers in Final Fantasy XV call them his foster parents (which would suggest Prompto has not been adopted, but is being taken care of by the state). His Japanese dossier doesn't mention foster care, simply stating he was taken in by a commoner family. In Parting Ways Prompto simply calls them his parents, but it is also said their relationship is distant and he hardly sees them. Prompto knows he is from Niflheim, as the dossier says it is his "long-kept secret." He hides his barcode, and one of his incidental animations is to check his wrist and become concerned when Noctis glances over at him.

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This is whats accepted by the community to be true, but i believe everything in the plot about arydyn and prompto.(from the first scene they are together at the top of the train, and maybe a little bit before) should be taken in question. I believe Prompto could have disguises and deceits of his own...but

If im wrong its because "Prompto Prompto" was ardyn in diguise. Making ardyn the Masters of Masters.---> Meaning MoM is Evil

Also one of my Main proofs for Ardyn being the Masters of Masters is Bahamut. All of the video games Ardyn lucis caelum is in so far include Bahamut. Final fantasy 15 has bahamut. Verum rex has bahamut(mention by the green dino in toy story world). I bet you versus-16 would have had bahamut(At this point im sure this whole versus-16 ordeal is just strategic manipulation of our POV so we cant put two-and-two together-----you know kinda like Masters of Masters manipulates?------the character nomura says he is most like.) Now the direct mention of Bahamut by the green-dino isnt just an off-liner, its there for a reason. Expect to see Bahamut become a boss to beat within the kingdom hearts series. And expect Bahamut's egg/crysyal thing to be in the black box.

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https://villains.fandom.com/wiki/Ardyn_Izunia