Ladies and Gentlemen, Hello. My name is Hajime Isayama and today I'll teach you how to write manga.
I must begin by saying that you should not be discouraged. At first glance, it can be difficult, but you only have to write 90 chapters perfectly tied together, with great characters and mystery to the world and titans, fantastic fights that actually serve a purpose with barely any talk no jutsu moments, and perhaps the single most important thing in all of this, Sasha being alive.
What you ought to do afterward is write a timeskip. This is meant for the end-series so we can have a "where are they now" segment but there is no need to worry about it because another timeskip will occur in the last chapter as we would have the pleasure of seeing in efficiency how terrible Eren's plan was. The first timeskip is primarily meant as a means of showing Eren becoming this evil incarnate that at no point in the series have we gotten hits about such alteration to his character. The second one is instead a quick reminder of how Yams got worse at writing a proper story without contrivance to its characters. Both are meant for Eren as he's convinced that all lives must be taken in order to obtain "freedom" and in doing so he ought to go against his friends causing an artificial conflict between him and the rest of Paradis as well countless third parties in which for entirely redundant reasons will join Paradis side and go against Eren. From this point onwards, you don't have to write anything decent since it will all depend on which character is to your liking the most and you'll always have to make him or her achieve whatever goal they are in need of. In this case, it's Armin. He's mastered the talk no Jutsu, I dare to say it's his strongest technique. Anyone he's talked to has been convinced to help him do whatever he's wanted to and its limits know no bounds.
With the power of friendship, Armin doesn't give up, not for one moment while he and co-venture towards Eren to stop him but first, we must go a bit before all that because you are clearly asking how all those characters have joined the Paradis side. Because of plot device, they ultimately were there because Eren too changed sides and there was no choice but to help their enemies. The two couldn't stay on one side only since that wouldn't make sense, just like it doesn't make any sense for Reiner, Pieck, and others to help Armin and Mikasa, meant solely as an excuse for "redemption" for some of the characters. Armin succeeds because of course, he did, Eren becomes dove because of course, he did, we never learn much about the titans and the few things we get to throw at us are pure nonsense in an asspull way upon the "paths" was introduced into the story which, for all intents and purposes is the main reason why the second arc of the timeskip is this bad. Historia getting sidelined from the story by getting pregnant off of some random farmer we never know anything about, which it's not the fact the child is not Eren's that pissed me off, but rather that she could've done so much that being someone's whore. To top it all, Eren Lelouch'd his ass out of and acts like he did something important or useful when all he did was fight for something he himself committed. I always knew he was going to do that the moment he becomes evil for the greater good but never wanted to believe it as I knew it wouldn't work with the story itself.
All the troubles Eren went through, all the people he killed, were just for his friends to live happily ever after. Instead of removing the titan course and finishing what he initially wanted to, he follows the most bullshit route and makes peace for a few generations... slightly for his friends to live their miserable life in complete serenity and with this in mind, the descendants to be inevitably killed. There is no point in taking so many lives when everything remains the same and what Eren has fought so far becomes useless because his goal was suddenly retconned when he confessed his "love" to Mikasa all of a sudden. Especially when you murdered 80% of the population and would've taken a mere couple of hours to exterminate the rest and finally be free of the burden. Even if Eren had somehow died because of that, it's still a better outcome of what we've got although it needs to once again be mentioned that what led to that would've been abominable regardless. It can't get out of character than this, and it makes no sense either given how Mikasa got to suck Horse's dick anyway. I wonder what Dove-Eren must've felt when he saw Mikasa getting fucked by the only person he didn't want to fuck her. I bet it's not sitting well with him.
"Thank you Eren for turning yourself into a mass-murder for our sake"
If you want more proof that Armin is the most hateful character, here you go. Eren is the worst character, but Armin is someone you would hate the moment he opens his mouth. When Armin mastered the talk-no-Jutsu it was as clear as day that he was going to succeed in convincing all of the previous enemies into joining his side to take down Eren, which he does, and that he had a plan into making Eren stop but think about it, why would Eren stop and how would Armin make that happen? Apparently, Armin never thought about the consequences, and the whole reason why he did all that in the first place was that it was against genocide, that there had to be a better option to put an end to this and in the last chapter he goes "Thank you for killing all them fuckers". What could have possibly happened between his determination to stop Eren and the last chapter that made him accept Eren's behavior and get along with everything he's done? Armin who is not only the brain of the trio, but was always been morally right, and looking back at everything he's always made the right and acceptable decision to put an end to something but in the last chapter he comes across as disingenuous and a piece of shit with virtually no fucking reason that let him to the settlement.
As for tradition, a good lead female in shonen is hard to come by and Mikasa is no exception. You won't certainly hate her as much as Eren and Armin but will sure get on your nerves with her stoic persona throughout. In the early series, she's got something to work with and her strength was admirable so for all the good reasons she was reliable in that department. I always liked her early on but looking back it's clear Yams either didn't care much about her or perhaps wasn't able to give her more stuff to do as the story went on, which I find extremely odd given how in the post timeskip she was suddenly given more importance than before but ended up being a leftover until the last two chapters gaining the determination to do the thing she should have done a long time ago. Mikasa is a bit awesome in her own way, but she has no ambitions of any kind and comes across as Eren's shadow. It is clear that she has had mental issues since she was a kid from the accident she and Eren had and her affection for Eren is due to this, but Yams does not look into this with the possibility that she may recover one day. Eren seemingly hating her was an excuse to make her grow and act on her own rather than following in his footsteps but she does nothing the entire time besides feeling sad at Eren's sentiments towards her because Yams never gave a shit about her.
I haven't talked about the rest of the characters but really, what there is to talk about? They all suck because the writing sucks and the story shifted from average (Marley) to the worst thing (War for Paradis) in a dozen or so chapters and it destroys everyone's solid characterization they once had. The transition from Eren becoming evil and after meeting Ymir was awful and the premise itself was bad, to begin with, because it didn't build up to characters that would eventually join the Paradis side to defeat a common enemy. It does this by assuming that everyone is fine in the first place, while that couldn't be feasible in any way. Yams wanted to give the characters more depth but clearly couldn't work with the way they were presented in the first place and also goes against their characters as previously they wanted to defeat Eren as quickly as possible without taking out everyone and yet waste time for trivial stuff. A "goal" of any of the characters who weren't on Eren's side, vanish because the final moments of the story is them trying to reach and take down Eren and in the midst of all the chaos down there, it's impossible to get any devolvement, and they don't, so Yams had to put Floch as a mini-boss before the final event as a means of showing the "cooperation" of the two sides of which couldn't work but the shitty writing proved me otherwise.
Which is better, the journey or the destination? The answer is both. But can everyone get that luxury? Unfortunately not. What one must do to get near to said luxury? Make the journey be worth the destination. If the AoT story had followed this thought of mine, it would've made sense. What was only needed is a linear thread to follow and find its end without splitting into different directions because you wanted to make it a more compelling approach to your story. You could, but why risk it when you had the answer right in the palm of your hand?
Eren died a virgin. That's all you need to know!
