Former Elf Companions Joining Solas (or not) In DA4

Actually they are wary of any magic involving spirits, which is not quite the same as saying they are afraid of the Fade. They regard spirits in the Fade rather as they view dangerous predators in the wilds. If they were afraid of the wilderness they wouldn't live there but they know they have to operate with caution and treat the other inhabitants with a wary respect. So it is the spirits they fear not the place they exist in.

The text doesn't say how often she saw it - but, obviously, enough for her to not run away screaming from Corypheus or not really even fazed that much about the extent of his deformities (in contrast to his power).

Also - I specifically mused about Minrathous and nobles in it, because I think it's more than likely that they have a higher percentage of magical deformities to spot there. Seems only logical. And the fact that Altus strive to have perfect offspring doesn't necessarily mean that they achieve that goal - and when they do not, it's sensible to assume that they use a ton of magic to substitute what they lack. We know even from Calpernia's story that the magic of the noble who tried to stop her at the end turned out to be pitiful and the guy had to surround himself with guards the blood of which he used to cast more powerful spells. So what matters in Tevinter is more apparition than the actual truth and the truth itself gets overridden with power. And if you get a ton of it how you look doesn't seem terribly important.

Snort laugh. Surely he wouldn't have kept Larius' body. That tainted mongoose.

To be fair,  "a sentient, walking pile of cancer" could accurately describe just about anyone in Orlais?

I gueeeeeeeess

Maybe some of the people allied with Corypheus didn't actually know he was a Darkspawn until he outed himself at Haven, believing until then that the "Elder One" they'd hitch their wagon to was merely an ambitious Tevinter magister making a power-play? By the time they learned what he really was, it was far too late for them to back out, so they had no choice but to stay the course.

Doesn't Calpernia actually see what he looks like during Crystal talks? One we collect to find weaknesses, but I'm sure it wasn't the first time they'd had a crystal conversation

Well that would depend entirely on his pitch. It is hard to know with tranquil since we know some seem content with their state recalling they only had anxiety when they were mages, so those ones might be more likely to oppose him. With Circle mages and saarebas there seems no evidence of him having reached out to them as he did to the Dalish. Essentially they are all lesser in his eyes than the "true" elves he wants to save. He isn't dropping the Veil to help modern races acquire greater magical ability but to "restore the world of the elves".

To Solas an ancinet Elf, having a large amount of magic was the norm for Elves in pre Veil Thedas. That was what defined them as not just a people but the only people, never forget that the word Elvhen literally means the People. Everyone and everything else was either an animal, a spirit or lesser. While Solas might gain a deal of sympathy for the modern 'races' of Thedas, even the post Veil Elves his first priorty is to the 'true' Elves. Everyone and everything else is either an obstacle or a stepping stone, never forget that.

Another interesting thing is what about the Elf-blooded possibly joining Solas?

Agur* (rumored)
Alistair
Eiton*
Feynriel
Gestan*
Kieran (Elf Warden/Alistair)
Michel de Chevin
Sabina's Brat*
Slim Couldry*
Thale*
* = alive regardless of choice

Slim Couldry is actually in Dragon Age: Deception. (Alistair too i think?)
Would be quite comical seeing Sabina's Brat running to Solas and saying "I wanna join!" and there's silence and Solas looking at him with a weird face.

Why would any of them want to join him even if he would have them? Michel de Chevin specifically denied his heritage; Alistair isn't even aware of his (not the elven bit anyway); Feynriel had to go to Tevinter for a proper education and it is likely he would gradually lose his elven identity as a result in order to flourish there. OGB Kieran loses the only thing that might make him useful to Flemeth. Non-OGB Kieran doesn't seem to identify particularly with his elven side if his father even was elven but there is a good chance he wasn't. The others you mention are very minor characters, such that I can't remember them or realised they were elf bloodied, but do they really identify that strongly with their elven side? Besides if the other humans would die, so would they.

Likewise, if Solas doesn't regard modern elves as true elves, why would he recognise or be interested in people who don't even look like elves simply because they had one modern elf parent? Feynriel, if alive and not tranquil, might be considered useful because of his unusual magical abilities that are close to those of the ancients but non-mages would be of no interest at all.