I've tried thinking about which characters in DFF are my favorite and which ones are my least favorite, but that becomes exceedingly difficult as the show progresses. The reason for this is, as many posts have pointed out, the way the show reflects reality and therefore has no "Good and Bad" no "Black and White," but instead simply has many different hues of grey. So, at the end of the day, it all comes down to one's opinion or the way one perceives a character. I will do my best to express my thoughts on each of the 9 main characters.
1. Por
The leader of the pack. He is one of the one's we're obviously not supposed to like as much; he bullied Non, he stole his work, he was two-faced, he almost killed Non. But he still has a bit of complexity added to his character what with his family situation. Ultimately, in my opinion, that does not excuse any of his actions. He is pretty low on my list.
2. Top
This is gonna be a short paragraph. I hate him. The things he did weren't as extreme as some of the things Por did, but he literally has no excuse whatsoever. He's just plain annoying, a bully with a backstory as long as his dick, which is to say nonexistent.
3. Fluke
I think he has morals? If he does he fully does not listen to them. His biggest flaw is his selfishness. I believe he would've ratted Top and Tee out when Top broke the camera if it wouldn't have caused a crack in the friendship of the group, and therefore his spot in the popular group in school. Because let's be honest, he doesn't give a rat's ass about his "friends," he doesn't wanna be a part of whatever they're doing 3/4 of the time. But his selfishness ruins what potential he might've had, to the point of him being downright creepy.
4. Tee
Now this is a character. I think his shade of grey is the perfect blend of both white and black. Yes, I obviously hate what he did, but at the same time I understand. I would rather jump off of a cliff than give someone other than myself problems, but if I was a little less like that and a little more cowardly, I think I could relate to him a lot. He wasn't as warm to Non as Jin was, but he definitely wasn't as cold as Por and Top were. And boy, does he have a past. It looks to me like he's been a part of his uncle's gang for quite a bit, which would obviously quiet the kindness in anyone's voice, if not in there whole being. He has a sick father he genuinley cares about and no other way to make money. He's in a corner. And while I believe there's always a choice, I understand why he saw the one he picked the clearest. The thing, though, is that he didn't want to hurt Non, he didn't want to bring Non to his uncle, it just wasn't as strong as his want for himself and his father to be fine. But this is what makes him stand out more than the other members of the original friend group. He regreted it. He feels guilty. It's quite literally haunting him. He never could and never will be able to escape that part of his life. He even brought Non 2.0 (aka White) right up close to himself, and he would do anything to keep White there, safe where he can see him. So while I don't like him, and he is easily one of the more everything-i-do-damages-Non characters, he is still a very interesting one.
5. Jin
I can't explain how much I hate him. When I was in elementary school there was an anti-bullying poster that said something like "a bystander that does not help is just as guilty as the bully." And although both Fluke and Jin acted as bystanders, I hate Jin more because he is under the impression that he is kind and innocent, and he is branded this way to all the other characters. Even Non believed it. He takes no responsibility for what he did, or rather, what he didn't do. I don't even think he feels guilty about what happened to Non, he so easily forgot about it. He moved on so fast for someone he saw as a "friend" or, going even further, a "crush." The most evil thing is that the change in the way he acted between the past (smiley, warm, there) and the present (frowny, cold, closed-off) was not due to the fact that he absolutely ruined this kid--someone he considered a friend--'s chance at a future by leaking a video of said kid being groomed, and then proceed to nearly (if not actually) kill this kid with the help of his friends. No, it was do to the fact that his new crush said they were just friends. That's so incredibly pathetic. I'm obviosuly not saying that crushes can't literally crush your soul, but I think he had other issues he could've been worrying about.
6. Phee
Up until episode 9 I absolutely loved him. But then he dissapointed me a bit (which he is aloud to do, he's literally still a kid; for that reason I haven't kicked him off of my list of characters I like just yet). He has a big heart, which was used to cause a lot of good, but unfortunately became his flaw. It started to grow until it out-weighed his sense of justice. I think he still loves Non and wants to know what happened to him, but not as much as he wants to forget and move on with Jin. He came to the house partly to get answers but mostly to fix his relationship with Jin. He started to like the friend group, so he wants to live in ignorance, and that I do not agree with.
7. Tan
Him and Non had a pretty weak relationship, but despite that, he still loves him (he loves his whole family, actually, even if their parents don't deserve it) deeply; deeply enough for them to be the only thing he's living for. In my--who am I kidding, the fandom's opinion, he is currently doing nothing wrong, killing people or not. He lost literally everything, and frankly, it shows. But instead of giving up, he perserved, which is more than Phee can say.
8. Non
Jesus Christ, this poor kid. A family that forgot about him while he was there, and loved him after he was gone, and a boyfriend that loved him while he was there, then quickly forgot him after he was gone. He'd never had it easy in his life and still didn't have it easy (possibly) after his life. If you think what happened with Keng was Non cheating on Phee, fuck you. Fuck you. That was grooming, Non was being taken advantage of. Although I don't really think of Phee sleeping with Jin as cheating, it was more cheating than Non and Keng. Yes, he pulled the rest of the friend group into the illegal money thing, but that was not his fault, it was Por, Top, and Tee's fault. So much shit happened to him, and none of it was deserved; I really hope he's alive and killing them.
9. White
I don't dare to have opinions on him yet because I'm really expecting a deeper backstory. I don't think he's as naive as he's letting on.
If you want to add any of your opinions, feel free to!