Now that I think about it. Tony Stark does represent the elite, his superpower comes from the machines he builds and he was supposed to dead but the blue thing on his chest keeps him alive. It reminds me about the lore of the elite that they have some sort of disease that make them got to drink human blood or depend on machine to continue living.
His conflict with captain america, and hydra being secret society who brainwashes people, turn soldier like Bucky to be a supersoldier. And Steve spent 2 movies defending Bucky, as if telling us all MK Ultra puppets are innocent. Even though they kill millions people (including the elite's parents if necessary).
Wakanda, a hidden highly advanced technology society, has the rarest metal on the earth, possibly from meteor (means government harvest or keep the public out from knowing that this kind of metal exists.
Scarlet Witch, the combination of witchcraft with technology. I will say infinity stones are metaphysical entities.
Doctor Strange is the guard of time. Possibly, time travel does exist but it requires the unseen power, magic.
Also doctor strange is a witch. Only the one with this power knows how.
Soul stone, a soul for a soul.
To attain these metaphysical powers, you gotta sacrifice your most beloved.
And not all them gotta make sacrifice, only the selected ones who have the quest to gain the soul stone.
Quantum realm, i do believe this realm exist. A realm where time does not work like in this 3D dimension. but i am not sure you have to be little to access it. However you need special technological advance to do this. Probably witchcraft too.
Alternative universes, there are theories that we actually have this. At least 7 universes happen simultanously. This could be a way telling us they find a way to cross universes and it requires the opening gate of quantum realm.
Captain America, LGBT undertone, diversities agenda I refrain myself to have opinion about these.
Hulk is the representation of dual personalities. A genius one and a beast. Multiply personalites have been the theme several times, Glass featuring James McAvoy.
I tend to categorize it with secret society and MK Ultra, just like Winter Soldier
But somehow the advanced victim can intergrate the beast and the self and can be useful.
What else?
Fat Thor?
Thanos, for me thanos represent the devil, a powerful ones who seek for these metaphysical stones because he knows their power and the human also aware of this treat.
He has army of the unseen.
All aliens like mantis, drax, gamora, groot are the creatures of the unseen.
Somehow maybe there are breeds of humans and these metaphysical beings like Quil. And they can be powerful.
Asgardian probably the society of the unseen. And they've been regarded as gods and goddess for centuries because they have special powers. But they are not gods. They are the djins. They can die.