Do you enjoy Homestuck, the original webcomic in its entirety (from the start of Act 1 on April 13, 2009 to the Credits on April 13, 2016), hosted on homestuck.com and better archived by the unofficial collection?

Genderfucked schizoqueer autistic plural plushie eevee mystics
one of those annoying vegans your unexamined ethical system warned you about
Seer of Blood (Wyatt) and Witch of Void (fractal)
not a person, ΞΞ, tma

name-color: #ff007b
Do you enjoy Homestuck, the original webcomic in its entirety (from the start of Act 1 on April 13, 2009 to the Credits on April 13, 2016), hosted on homestuck.com and better archived by the unofficial collection?
i've seen a lot of trans narratives in terms of killing their old self, murdering the self that was constructed for the world, killing the False so that the Truth may live. and i've seen many trans narratives lean back towards the Old once they carved the space to explore, approaching cautiously the gender they once ran from to scavenge the pieces they liked from the shell.
i've also seen many plural systems express this in a different way: you killed the AGAB, and the AGAB came back. turns out they weren't entirely fake, just contextually limiting.
the AGAB self often ends up cast aside, or worse, a corpse, abandoned for a flashier New that leaves what Was in the dust behind. and they're often angry that they had to be killed so that someone else might live, now that they have had the space carved to truly Feel.
to exist pre-transition, to exist in that identity haze, is oppressive to both sides of that coin. neither side has the space to explore, but one side makes it easier to fawn for others into reducing your needs, and that fawning is what holds us back.
but at the same time, it's not their fault, is it? your sense of self was traumatized into a mould more convenient for those Outside instead of being allowed to form and develop naturally. it's not the fault of the one shoved tightly into the mould that the mould restrained you.
i've often described my pre-transition self as being "more mirror than person" by the time i broke out of that. i describe it as breaking the mirror, flowery language that, while symbolic, disguises what it truly was:
i murdered him so that i could grow beyond him.
i think it's important to note that i'm coming at this from a plural angle, and i can say from years of experience both being plural and talking to and helping other systems both new and old: repression makes things worse, demonizing a part of yourself makes things worse.
when you cleave off "these are all the things about me that i don't like" and put them in a box, and then blame the box for being like that, that doesn't actually solve the underlying problems that created any of those patterns in the first place, and in fact often just leaves those parts to fester and grow resentful.
it doesn't actually improve anything to cleave off your past and go "this is the Evil Person I Am Not Anymore, as opposed to me, the New Good Person", because then you leave everything you assign to the "Old Evil Person" unresolved, and leads to that seeping through in its worst form when it's not allowed to exist otherwise.
the only way to help put those patterns to rest is not to demonize them and lock them away, but to fully confront them, actually properly process them, and give whatever remains under that exterior of bile a hug. a lot of times those harsh reactions are adaptations to traumas, adaptations that kept them alive while they were still under all that stress. and even though those adaptations when taken out of that live-or-die scenario are really really hurtful, it doesn't actually change that they developed as a survival mechanism, and purely demonizing them doesn't actually change that.
to actually heal, to actually grow beyond those traumatized patterns, you have to understand why they developed, accept why they happened, and help that scared part of you understand that it's safer now. it doesn't actually fix the problem to call them bad and evil and wrong, you have to actually approach the problem head on and deal with those negative emotions. there's a reason the original post is evoking imagery of Celeste, that's where the "part of you" phrasing is from.
you compared forgiving your past self to forgiving an abusive family member, and i really don't think that's the case. you don't have responsibility to family, none whatsoever, and i can say that with full confidence as someone estranged from half of mine. who you do have responsibility to is someone trapped in a brain with you, someone you put away under lock and key and never let see the light of day openly. or, even if they're fully blended into you, and those "worst parts of you" are patterns of just you that need to be healed...
you at least don't need to take glee in their death. you owe the person you used to be at least that much.
sometimes it's convenient to basically exclusively date online because there's no way in hell my abusive ex could show up at my door, i doubt they could afford the plane ticket