Obviously Harry Potter's group Dumbledore's Army is mostly made up of good 'ole reliable Griffyndors, but that doesn't mean that they're all just a bunch of goody-2-shoes, Hogwarts has more to offer than that. Some of them have a bit of a chaotic streak, some of them are just by-the-book good guys, and some of them are actually super rigid in their unflinching devotion to all things just in the world.
It seems like there must be some sort of perfect mapping system for this... Oh! That's right! The trusty Dungeons And Dragons moral alignment chart, originally intended as a nifty tool for mapping your character's morality, but it'll serve our purposes great here!
Harry Potter: Neutral Good
Harry is technically the hero of the story here, even though there are tons of other well-loved characters in the franchise, and we all know who the real chosen one is since he appears further down this list, but Harry's moral alignment is kind of an odd one to parse.
He did some things that definitely weren't "good" to the Dursleys, even if they probably did deserve it, such as inflating his aunt like a balloon, but we also see him taking on evil pretty much wherever he can find it at school, even though it's usually caused by Voldemort from behind the scenes even though that isn't always the case. Due mostly to his unorthodox methods, Harry gets a neutral good.
Ronald Weasley: Chaotic Good
Ron Weasley isn't necessarily known for being the most levelheaded or the least airheaded, but he's always there for Harry when he needs him, other than their brief spats with each other at various points throughout the series.
It would probably be easier to give him a lawful good rating if he didn't spend most of the series with a broken wand, or if he didn't flee from danger when things got scary, especially when it comes to his crippling fear of spiders, but he's shown himself to be remarkably brave when it counts most from the very first story, in which he almost gave his life in a chess match. Given circumstances mostly beyond his control, he gets a chaotic good.
Hermione Granger: Lawful Good
Hermione Granger, perhaps in the most expected turn of events in this entire article, receives a lawful good rating. How could she not? She's always the voice of reason. While Harry and Ron are both constantly breaking rules for the greater good, Hermione has this almost built-in instinct for following rules, and especially in the first few books and movies, she only gets involved in the situations that Harry and Ron are in because she knows that if she doesn't, they could very well end up expelled.
While Harry and Ron are pretty okay students most of the time when all their time isn't going to solving mysteries and they care about the subject they're studying, Hermione makes sure that all her assignments are done, always, in addition to extra credit. Maybe that's why her punching Malfoy was so satisfying.
Neville Longbottom: Neutral Good
Here we are, the actual hero of the story, Neville Longbottom. For those of you who don't know, that's mostly a joke, but Neville actually fulfills as much of the prophecy that Voldemort was so obsessed with just as well as Harry. While most people especially early in the series aren't keen on Neville since he's just a bit of a bumbling idiot who seems like he's mostly there for levity and comic relief when situations get rough, he goes through a pretty drastic change.
After he trains with Dumbledore's Army, his abilities have increased by a ton, becoming a legitimately powerful wizard. He also leads a revival of Dumbledore's Army after Voldemort's Death Eaters have taken over the school. He gets a neutral good.
Fred And George Weasley: Chaotic Good
Fred and George Weasley, ever the pranksters, henceforth let it be said across the land are chaotic good. Even though they're constantly pulling pranks on whoever they can manage to fool, they're good-hearted people through and through.
A lot of their pranks were committed just because they seem to have a bit of an aversion to authority figures, but they understand that there's a time and place for a joke, kind of. They also proved themselves to be brave and worthy of praise at the Battle Of Hogwarts, where they fought valiantly. Fred gave up his life for the greater good and George lost an ear.
Luna Lovegood: Neutral Good
Luna Lovegood is a difficult one to place, mostly just because she's an odd bird. She has an affinity to animals which helps her out and definitely humanizes her just a little bit, even though she's definitely the most Aquarius of Aquariuses in the Harry Potter universe.
She's got an unmistakeably aloof demeanor, but that doesn't mean that she's not kind-hearted, she's just in space, thousands of lightyears away most of the time. Definitely neutral good, but only because she's too far out of this world for the other two classifications in the category.
Seamus Finnegan: Neutral Good
Seamus Finnegan, the only notably Irish person throughout the whole of the Harry Potter franchise is a pretty simple placement even though he originally sided with The Ministry Of Magic when Harry was made public enemy number 1. It wasn't that he didn't have his heart in the right place, but more that he didn't know who to believe.
It's also telling that he refused to leave Hogwarts until after Dumbledore had his funeral.
Cho Chang: Neutral Good
Cho Chang, well-known for being Harry's first serious love interest and then just kind of dropping right off the map when J.K. Rowling decided that Ginny made more sense, is a neutral good character.
Even though Harry has issues figuring out how girls work and can't really keep his relationship with her afloat, he doesn't have hard feelings and neither does she. This means that when the time comes to fight on the side of good in the Battle Of Hogwarts, she puts any sort of history aside and does the right thing.
Ginny Weasley: Lawful Good
Ginny Weasley is definitely lawful good, so much so that when she had her crush on Harry, Hermione specifically had to tell her that maybe she should go ahead and try to date some other guys so that Harry would notice her.
Any sort of dishonesty about her intentions hadn't even occurred to her. That being said, she isn't empty-headed or a non-character because she follows the other members of D.A. to go and rescue Sirius when they realize he needs help.
Dean Thomas: Neutral Good
Dean Thomas, best friend to Seamus Finnegan gets a neutral good descriptor, mostly because when he doesn't know who best to side with after the story about Harry making up lies comes out. Dean knows that Harry's right about Voldemort being back, and if J.K. Rowling had space to put his backstory into the first book, we'd know that he'd have reason to worry. Not only is he a half-blood, but his father was also killed by Death Eaters when he was young.