Those are very good points. Thanks!That simple sense of right and wrong is a code (a very basic one, obviously), but if he attempts to follow it rigorously, then I'd classify him as Lawful. And you've actually made him more Lawful by giving him a tendency to categorizing people, and creating a sort of hierarchy of villainy that he places evil doers on. And their placement on that scale helps him determine how he interacts with him. He is building order and structure into his actions. That is a Lawful sort of thing, the way I look at alignment.
As for good/evil, he is neither. It's that "it's his job" bit that you mention. He's just doing what his code tells him to. A good person will have room in his heart to consider mercy, an evil one will bend his code for his own pleasure or gain.
Your character has created a code and aims to follow it above all else. That to me is LN.
I'd go with very much Chaotic Good.As I'm thinking about it, he doesn't really follow an external code at all, just his own simple sense of right and wrong. This generally involves protecting the helpless and innocent from those who would prey on them. He tends to categorize people as either villains, victims, or neither, based on their behavior. He is not above roughing someone up whom he categorizes as a villain in order to get information, and he has no compunctions about killing a serious villain outright if only to prevent that person from victimizing others in the future. He takes no particular joy in this. To him, it's just an unsavory but necessary part of his job. He evaluates each person on his or her own merits, and he doesn't waste his time on petty wrongdoers, focusing instead on serious villains.
What matters is how you view your character, and how you view the alignment.
It's better to have a clear character concept, and a muddied view of alignment, than the opposite.![]()
I think we will never be able to agree, because this looks like a fundamental sticking point. I will never accept that. To me, a Lawful character is Lawful because he seeks to find order, structure, predictability in his actions and the actions of others, and seek to create that order and structure in some way.No. I disagree.
. . . In order to have an effective distinction, a lawful character must have some referent outside of themselves. A "law" to follow.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.