I really really like this MC.
He speaks his mind when he has things to say and is an actually kind person.
For instance, when the girl he went to the battlefield said that the soldier in the prison who couldn't get used to all the death was weak, he said, "Excuse me, I'm going to say something outrageous but it's better to not get used to death in that way." Like he clearly cares about the mental health of the people around him.
Regarding the kindness aspect, you get that so often in stories. Oh so and so is a "nice" guy but in the story you wait for that kindness to show itself and it never does. All that's ever seen is the basic decency of a human being following the law and not being a shithead like 99% of the population. This guy overtaxes himself to properly bury his allies, takes the initiative to meet and help the sick, all while respecting the people who he talks to in a way that they let down their guard around him.
I wish this had a WN or LN. I'd be marathoning it about now. Love these kinds of protagonists.