SpoilerIs Aymeric really loved by all Ishgardians? 
I'm not quite sure about this, but may his legitimity be questionned? With the blind faith of ishgardians for the Holy See and the isolated war-life they've endured, is the "truth" admitted by all? What do you think?

Spoilerconsidering Aymeric's status as a bastard son who rose to power by his own merit, he's likely seen as a champion to the common folk, and it wouldn't be a stretch to assume they'd love the idea of class equity. so I can say with almost 100% certainty that lowborns/commoners would support Aymeric. 

we also know that at least one of the former High Houses (Fortemps) supports Aymeric, so there's them as well. however, Fortemps has shown itself to be one of the more progressive Houses, so you can be sure that it's not the majority opinion. (Haillenarte is also questionable though - they seem to have similar tendencies to Fortemps as a result of friendliness between the two. and let's not forget the fact that the WoL helped save their reputation, so Haillenarte is likely to be more amenable to their cause.) 

Dzemael and Durendaire probably, as a whole, consist of the most dissenters with regards to Aymeric's legitimacy. 

most highborn Ishgardians would likely oppose Aymeric and any change in class system because of their goddess given 'right' to rule. that, and as was mentioned by the late Thordan VII, it could throw many families into despair because their loved ones' noble sacrifice in the Dragonsong War would mean nothing. a lot of the Ishgardian psyche as a whole is built upon the idea of warring with the 'evil' Dravanians, so a lot of people could wind up disillusioned and without purpose.

so, I'm fairly sure that Aymeric and the 'truth' he champions would be a very controversial topic, and yet another issue that divides Ishgardian opinion.

SpoilerWhy I think Aymeric sort of does have blanket support of the people is because of, and in opposition to his legitimacy in the city and talk of it amongst both highborn and lowborn peoples of Ishgard.  As it is stated through the MSQ, he is recognized as the son of the supreme head of state by most, but is greatly known for his lack of attention to this fact, and his upcoming in the government through hard work rather than blood status.  The people will likely know of his action against his own father, and the kind of courage and heart it takes to choose one's beliefs over their family.  It would be hard to hate him, but not impossible, and I think that is going to come from confusion over events, possibly if your character had a family member or leader who is their advisor or confidant that feeds them their own misgivings about what is currently happening, I could see that influencing your character and making it possible to be seduced by lies.

You would always have a simple dislike for him now in the knowledge that we have seen him bow before Midgardsormr himself, which I would think may immediately garner a dislike for him even if he/she accepted his place as temporary governor of Ishgard.

Sins of Antiquity cutscenes[youtube]Ys66MkRjw4M[/youtube]

(shoot, this info is actually a spoiler up until the level 56 MSQ 'He Who Would Not Be Denied')the fact that Aymeric is the Archbishop's illegitimate son caused him a lot of problems in his youth still stands. while he may not have used his blood relations to secure his position, you've also got to consider the idea that some people (probably highborn, as they value heritage over practically everything else) may still hold less than favorable opinions of him by virtue of his parentage alone.

spoilers up until the final level 60 MSQ 'Heavensward'and I hadn't thought of the implications of Aymeric bowing and apologizing to Midgardsormr, actually. for people who are still mistrustful of the dragons at best, this could throw the legitimacy of Aymeric's position for a loop. could actually be a great stepping stone for a former inquisitor character. (I say former, because it was an arm of the Holy See, and wasn't that dissolved?)

SpoilerI guess I could be able to construct a character whose family have been greatly involved in the war and the hunt for heretics. A House that values heritage and duty to protect the Holy See in a neverending chaos against the dragons. 
Let's say this character has lost close friends and family members - maybe even the man she loved - in this war. She would have all the reasons to hate dravanians above all and throw herself in a raging crusade against all that relates to dragons. 
Now that the war ends and that Aymeric rises as the new ruler of Ishgard, she realises that all she believed in are all lies and that she hasnothing left remaining, apart from an overwhelming hatred she must conquer to adapt and live in a changing world, full of uncertainties. She's likely to be lost and missunderstands why someone as loved as Aymeric would kneel before a dragon.
Knowing the past of Aymeric and his political ideas she could fear that the changes he will bring to the city will destroy her status and make her an equal with the lowborns - whom she despises.
She will never share publicly theses thoughts - she will wear a perfect mask of dignity and pretend to "adapt". But she will be weak - and anyone who could whisper the correct words would easily push her to commit the worst deeds to secure her position and soothe her hatred. She will definately live in the past and will never be able to adapt to the new world, unless someone could possibly heal the wounds of years of sufferings as an heritage from her house.