About the Emperor [Major Spoilers for 4.4]

[Lauront]

If anything, recent lore suggests Eikons/primals are even MORE of a threat than we had previously surmised, as they can be summoned with great facility and very few resources. The OP also has several points that require clarification.

Solus was not taken over by an Ascian. He was an Ascian. Yet he could have sex. I mean he has children. And his body aged over the course of his life.

You're reading far too much into this. He said the founding father of the Garlean empire is an Ascian. Not that Solus was always an Ascian. They are incorporeal - quite clearly, since "Solus" causes the body to re-appear when it is shot. If an Ascian were to use the host, which is corporeal, to have sex, perhaps it remains fertile/virile and can bear children. Will it inherit their powers? Probably not unless they enhance it in some manner prior to possessing it.

Since Solus is an Ascian overlord he is probably capable of magic beyond what we have seen before. So his children should also be good at it,

Unclear. The Resonance is probably the medium by which the Ascians render the host suitable. Some Purebloods, according to the lorebook, can wield magic, but it's rare. It's not an obstacle to the Ascians.

Half of Solus' hair is black and he founded the bloody nation.

It was never suggested that they were all blond - just most. I mean we knew there's white-haired ones. They do seem to predominantly have very light features, no doubt in consequence of their adaptation to their cold environment.

The ideals of Garlemald are all.....
LIES!!!!! Poor Theo

Well no. The lie here is that Solus believed in them. It does not mean the Emperor or Garlean people do not. And this is assuming the Ascian is not lying. I am going to throw in some speculation here, as it's unclear when Varis became aware that Solus was possessed by an Ascian, but assuming it was whilst Solus was still alive and not recently, he probably thought he was done with that whole mess when Titus was killed, giving him the opportunity to steer the Empire in just the direction Solus claimed to want to move it in. This works even if Solus had made his true intentions aware during his lifetime, although the narration in the epilogue suggests that Elidibus brought him back to soften Varis's resolve/resistance, through exposing this alleged truth - only, it hasn't worked.

Considering what he is I think he was totally on board with the whole shebang.

Considering he was an Ascian, big deal. Varis and Gaius's opposition is more significant.

Nah. It will be Solus.

We have no idea but it is probable that it is "Solus", would be the correct answer.

But that's a lie. Solus does not believe that. All the ideals of Garlemald are just propaganda for the masses. In truth everything he did was to make matters worse. Sure, Varis is totally on board with the true beliefs and if we take down Solus and he finally becomes Emperor for real he could create a Garlemald that actually follows those ideas, but that is not the case at present.

"Solus" doesn't. Yet he is an Ascian who was dormant until recently.