Finished Season 3 again.
Really interesting in that the character arcs are reflected here pretty well through the end of the series, and the season finale kind of hints at the series finale.
Howard is a dick once or twice, but overall he and Kim are the two main characters who are generally selfless. Howard tries to be cordial with everyone (aside from his stunt at the restaurant to Kim, with Mesa Verde watching) and he also is the only one to respectfully stand up to Chuck to do what needed to be done, despite the cost to himself.
Nacho will do anything to protect his father, including accepting shame and even rejection -- so his father's misunderstanding of his character hurts him but he will still do what must be done to look out for his dad.
Kim learns her limitations here, it's her first real battle of self-awareness and reality where she realizes obstacles cannot be overcome by sheer force of will alone. Here, her physical limitations become obvious and she needs to practice some level of self-care. This is also essentially what she does in the middle of Season 6 because Jimmy is unable to... although she then spends a few years punishing herself as well for failing.
Jimmy "won" the McGill feud with the episode "Chicanery" but he is so furious over his insurance premiums going up so much as a result that he decides to stick it to Chuck as well. In the process, he derails Chuck's recovery and put Chuck in the position of making an inappropriate response to retiring. The latter is still Chuck's fault, but maybe if he had been given more time he would have reached a place of more maturity and acceptance towards moving on. Chuck meanwhile then responds to the HHM loss by hurting Jimmy as badly as possible by saying, "You never really mattered much to me." I think it's the last thing that is ever said between the brothers. This drives Jimmy to cynicism and he doesn't really change directions again until the series finale.
Mike kind of accepts that he can't stay out of the game if he wants to take care of the people he loves beyond anything in the world. It's touching how he goes and finds the innocent bystander's body in the wilderness so at least the body is found and buried properly and the loved ones have closure of some kind -- even though he didn't kill the man himself, he feels culpable because he set up the situation that got the man killed. Mike has a lot of regrets over the things he has done in his life, but it's reminiscent of Mike Sullivan in "Road to Perdition" -- he feels like he's damned, but he can still look out for the people he loves and accept the shame of that to help them. he and Kim are kind of the same in that both quickly accept responsibility for their own choices and will sometimes take on great burdens to "do what is fair" based on their promises.
Jimmy's decisions in the series finale are also reflected somewhat in the Season 3 finale.