There's a scene in Trigun where Wolfwood is on a bus with children. The bus is being attacked. A gang has cornered them on a wasteland highway, and one of the kids - maybe nine, maybe ten - is bleeding. Wolfwood is supposed to be a travelling priest. He is dressed like a priest. He is carrying a cross three times his own weight which he says contains the word of God. It contains a machine gun.
He uses it.
The gang members hit the ground. Vash the Stampede, our protagonist, the man with the bounty on his head and the commitment to never take a life, is not on the bus. If Vash had been on the bus the kids might be dead, because Vash would have tried to disarm, to stall, to negotiate. Wolfwood does not do any of that. Wolfwood pulls the trigger and the bus drives on and the kids live.
This is what the show is. Not Vash. Vash is the title. Wolfwood is the argument.
The man who does the killing Vash won't
Vash the Stampede is a great character because he is, in the most literal sense, committed. He is committed to a rule. No one dies by his hand. Not the men who burned a town to lure him out. Not the children of Knives, his brother, who have spent a century plotting humanity's extinction. Not the soldiers, not the bandits, not anyone. He is a pacifist built into a wasteland where pacifism gets people killed, and Yasuhiro Nightow lets him have it - lets him carry the rule, lets him pay the cost, lets him be the golden man at the end of the world who refuses to become what the world says he should be.
This is noble. It is also impossible. The show knows this.
Wolfwood is the show's solution. He is a pragmatist where Vash is an idealist. He is not a bad man. He is a man with a different idea of what love costs. He grew up in the Eye of Michael, the faction of zealots who raised him to be an assassin, and the reason he kills without hesitation isn't that he enjoys it - the reason is that Wolfwood was taught from childhood that the people you love only live if you are willing to do the work of protecting them. Vash's rule produces corpses. Wolfwood's rule produces corpses. They have chosen which corpses.
Nightow does not let either of them off the hook for this. That is the whole show.
He's raising the orphans in secret
The orphanage is the hinge. It's the thing most casual viewers forget because the show is stylised and gunslinging and full of set pieces, and the orphanage shows up in episode 19 and gets burned through you like it's nothing.
Wolfwood has been sending money to an orphanage in the desert for years. Before he met Vash. Before any of it. The money comes from his work as an assassin. The kids he is raising are being fed, housed and schooled on the earnings of what he kills. He knows this. He lives with it. He does not tell the kids. He does not tell Vash. He shows up at the orphanage sometimes and plays with the children and the nuns look at him a certain way, a way that says we know where the money comes from, and we also know what would happen to these kids without it. He leaves. He goes back to the road. He kills again.
This is not a backstory reveal dropped for sympathy. This is the moral structure of the character. He has already made his peace, or tried to, with the proposition that the world contains children who will go hungry unless somebody is willing to do ugly things. He is that somebody. He is not proud of it. He is not ashamed. He has weighed it and he has carried it and he does not think Vash's refusal is wrong - he thinks Vash's refusal is a luxury paid for by people like him.
He tells Vash this, kind of, near the end. He doesn't put it in so many words. He says something like you're the hope, and I'm what keeps hope alive, which is a romantic way to put it but it's the closest Wolfwood gets to explaining his ethics.
The death in the church
Wolfwood dies in a church. Of course he does. Nightow isn't subtle and isn't trying to be. Wolfwood has just been through a fight with Chapel, his mentor, the man who made him what he is. He has won. He has killed the man. He is bleeding.
He walks into the church. He sits down. He lights a cigarette. He talks to God, or to no one, or to the absent Vash, and he says the thing that breaks the whole series open: I wanted to live a little longer. I wanted to see them one more time.
That's the line. That's the cost.
Vash kept his rule. Wolfwood made Vash's rule possible. And the price of making Vash's rule possible was that Wolfwood does not get the thing Vash gets, which is more time. He does not get to see his kids grow. He does not get to go back to the orphanage. He does not get a redemption arc because Nightow refuses to pretend he needs one. The ethics of the show are simple and ugly: he was always going to die, because the kind of man he was always dies, because the kind of man Vash is gets to live because someone else was that other man first.
The scene cuts. He's gone. The cross he carried is abandoned on the floor of the church. The machine gun inside it is still warm.
What the show is actually saying
Trigun is often described as a show about pacifism. That's not what it's about. It's about the cost of pacifism. It's about who has to pay so that a golden man can walk through the desert with his rule intact. Vash is the beautiful idea. Wolfwood is the accountant.
The most honest thing in the entire anime is a shot, near the end, of the orphanage still standing. The nuns are still there. The kids are older. The money stops coming and nobody can explain to them why. One of them asks about Wolfwood. The woman raising them says he's away. Travelling. On the road. Doing the Lord's work.
She is not lying, exactly.
She is holding up a photograph of a man who loved them enough to become something terrible, and she is letting the children believe the terrible thing was the holy thing, because in this show they were the same thing, and that is why Wolfwood, not Vash, is the character you cannot forget once you've watched the whole show. Vash is the promise the world keeps breaking. Wolfwood is the man paying the bill.