Okay guys but think about Aymeric for a minute.
He is adopted into a family of nobles when he comes from, possibly, a low born mother who was possibly forced into sleeping with a powerful man like Thordan. Had to keep quiet about it and possibly lose her son right after giving birth. Aymeric grew up hearing rumours about being a bastard, about not deserving his life, about how lucky he is, how he was probably a mistake.
And now he is the only one alive to carry on the Borel name, becomes the lord commander of the temple knights at a very young age, then lord speaker of Ishgard, slayer of Fafnir, unifier of dragons and men after a thousand year of war. All this while he grows up hearing he will never be good enough. Imagine how insecure that must make him. Having achieved so much will not make him think "wow, I really am amazing. Sure showed them!" It will just stress him out even more, thinking he can't do it, he isn't capable enough to carry these responsiblities out, not deserving enough to. In fact, idk if we've ever seen him being proud of himself or even happy? Doesn't he always want to jump to the next task? He is too humble for someone in his position, sometimes it's like he doesn't believe he is actually as good as he is said to be.
I think this is shown by his decision to give up his position as lord commander as soon as they finish dealing with Nidhogg. Like, he will do his duty and stop. Because he doesn't think he can do it anymore. He thinks he is not important enough so he goes to confront his father by himself in the lion's den itself, so to speak. Practically kills his father, almost kills his best friend to do his duty, brings about peace and much needed change and gets stabbed for it. How shit must that make him feel about himself?
Aymeric is so good at being a well spoken, smooth politician, we forget to see how broken he must really be inside and he is all alone. Even Lucia isn't with him anymore, having to stay at Garlemald.
The way his eyes light up every time he sees the warrior of light, calling them 'my friend,' every second sentence, as if pleading to be called the same. Writing to Estinien whenever he can, having a deep wanderlust and adventurous spirit but being unable to fulfil it. He is so much like G'raha in this sense but unlike him, Aymeric hasn't gotten his happy ending yet.
The man is so alone but so dutiful. So insecure but so good at hiding it. He craves connection but his duty forces him to be unable to make it. I cannot imagine how hard he has it.