In your opinion, which hero has the most charisma in the campaign?

Dwarves are simply based on ancient Vikings. They live in the north, possess rune magic, and their titles are: Jarls, Earls, and Thanes. Therefore, in my opinion, there is nothing surprising about the hero resembling a god of war.

Added 21 minutes later

Is Agrael a loyal character? Wow! But Aranthir is not at all righteous. He does whatever Asha orders him to do; if she ordered him to destroy the empire, he would. And Gotai doesn't stand out in any way. He's just a dumb Orc. And he wasn't shown very much.

Agrael being loyal is purely my personal opinion, without claiming it's the only correct one. It's clear that Aranthir acts on Asha's orders to save the empire, but he should also have some personal gain, like Marquel. He also saved the empire, but he also established control over it and built up his own cult. But Aranthir should simply have a monument erected in his honor and be included in the pantheon of Asha's saints – his behavior is somewhat uncharacteristic for a necromancer. But again, this is just my personal opinion.