i think the way it helps to think of these guys as not the "full definitive versions" is to read more about different versions of these characters (in fanworks, mainly), and think of these as complimentary: under some circumstances, some of them become one way, under others, they change. after all, even HSBC has two separate timelines, and candy is explicitly framed as a bad fanfic!

we're now pretty firmly out of the whole mess of candy, it's surely going to come up but in a very different light, and maybe the focus on the new session/meat timeline will help you move away from the candy versions as the definitive ones. homestuck has always been interested in different versions of the same character, like, for example homestuck proper also deals with this: how can one enjoy dirk strider as a character knowing that in the beta timeline he was an abuser to dave? dirk's explicit answer to this question is that bro is literally just him, is an extension of him, and in order to be better he should be aware of this, and in a similar vein, in order to enjoy dirk strider as a character, we as the audience should be aware of what he becomes in other versions of him. this isn't all negative: HSBC recently retconned a seemingly nice and non-fascist jane, and i'd imagine we'll see that further explored as the other side of the coin to jane's character: two versions of her, one where she became a fascist dictator like she was raised to be, and one where she unlearnt that harm and became better. we need to understand that all characters in all versions of them are still those characters, e.g. evil jane from homestuck proper is still a jane, an extension of what she actually is and could become, these dichotomies are just a lot more harshly pronounced in post canon stuff.

it's understandable to be upset when a character you like turns into a horrible person and the story focuses on that, but also i think you should try to go into post canon stuff, especially going forward, with a little more faith, and i definitely think the answer for what could restore that faith is engaging with fanworks of alternate endings for these characters. it helps to think of these characters as not just having one path they follow, but multiple branching conclusions all of which still reflect on and ultimately are that same character, if that makes sense?