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Are the Chaos gods actual singular, quasi-physical entities with personalities and a conscience that is capable of saying “I am Nurgle!” or are they simply existential concepts like decay, change, conflict, and obsession that have been given sentience by the warp, much like the hive mind, who has no physical or singular form but is the collective communication of the Tyranids? To further clarify my question; can a follower walk up to Nurgle or Khorne? I know we are talking about metaphysical situations here, but I read things like “Tzeentch may call forth enough power ...“ and that could be taken in multiple ways, like he is a relatively physical being who can wield power, or is it a concept or force that compels things to act in certain ways. Daemons are a part of one of the ruinous power’s own power given form, but again this could be poetic language saying these warp being are influenced by this concept and are compelled to act a certain way, akin to its nature, much like Judeo-Christian angels (who in the mythos are physical beings, while God is abstract and merely felt as a presence) , who lack free will as opposed to a physical splinter of a chaos god.

The first with all the daemons under them as splinters of themselves which are also independent. In a way they're like both really.

And yes if you can managed to get to them you can walk up to the gods. There was a bit about the palace of slaanesh in one of the daemon codices, I forget which. But it described all you needed to go through to finally get to the palace then that if any mortal were to even look at slaanesh they would lose their will to them forever.

Both and neither at the same time. They are a literal metaphor conveyed through analogies. Except their servants and bludgeon you to death with the moral of the story.

Well, the gods were given depictions even back in 1st edition.
I think they became characters of their own when Daemons became a proper army in 40k and fantasy. That's when each god's domain was described as if it was a physical place in the warp (such as Nurgle's garden) and there was even some interaction between them and their servants (such as Skarbrand damaging Khorne's armor or Kugath falling into Nurgle's cauldron). Before that, they'd do the same thing for all eternity, like sitting on a throne, piling skulls, or forging endless schemes.
They are closer to Greek deities these days.

Technically, yes, they do have 'physical' forms. This is shown by stories of other daemons and even beings of the real world interacting with them.

However the warp has no physical boundaries or even time. In my opinion, for the fluff to make sense, there must be two depictions of the warp: the physical plain which real world creatures can interact with (a sort of extention of the real world that the gods have created so that they may react with real beings) and the psychic plain (a timeless realm where the gods enact their endless war).

This would be the only way that the warp could both be an infinite, ever changing, timeless universe and yet still allow real beings to travel through.

It would make sense that the gods would prefer to keep real beings in their own small section of the warp which they can control, preventing real beings from being lost in the impossibleness of the daemon warp.

Sorry, it is hard to explain since, to us, the daemon universe is impossible using the rules of our universe.

Tzeentch is a tree whose faces are in his hands. Khorne is an alligator, Nurgle is a great unclean one, and Slaanesh, I believe, has no fixed appearance. * on consulting the literature, these are not great descriptions.

As for separate planes, I don't think that's necessary. The way the wall works seems to be that things that are alike are adjacent to each other. Ork space travel just involves jumping into the wall and changing that they want to find a fight, and then they travel to a place where they can find a suitable fight, without needing to navigate. The primarch made on Terra with wolf DNA was teleported randonly to a planet already occupied by wolves. By that trend, if you walk or astrally project yourself into the wall, without a ship, you will probably find yourself adjacent to things that are obsessed by the same things you are, e.g. if you live only for bloodshed and think of nothing else, that is the place you will find yourself in the warp.

I think it's very much one of those "3-D object passing through a flat world" type of cosmic craziness, with the gods being able to manifest on our plane (i.e. having bodies and whatnot) but at the same time that's all just a tiny slice of a whole we can't even comprehend. I mean, they are given physical descriptions and do relatively mundane things like sitting on thrones and working cauldrons, even though everything Warp-related is explained as something altogether bizarre and eldritch.

'Course, I'm assuming it's intentionally vague so you can decide if you want a traditional Hell you can actually walk through, or if you want a maddening horror-fest along the line of the ending to Earthbound.

The chaos gods are fickle, they do not think like human people, they give support to those who do not deserve it or crush their most devoted followers, we are just ants for their amusement.

There are no wolves on Fenris. There never were.