oh please tell us about the relationship between junko / imposter & what became of them after her death i'm always so curious about it
Oh hell yeah!! Thanks for the ask!
Basically, I think Junko was the darling of class 77, (more simply, the Makoto), and most of the class had some sort of romantic entanglement or deep friendship with her, with only one or two exceptions. Imposter is not one of these exceptions, and they are taken in by her strong personality and excellent mimicking abilities.
Their relationship with Junko takes a turning point when Junko and Byakuya decide to fake-date for the press coverage, (and to avoid rumors about Byakuya's sexuality). Since Imposter is currently ALSO Byakuya, Junko argues they should also fake-date. The original Byakuya encourages this plan, so he can avoid Junko as much as possible. While Byakuya and Junko only dislike each other, Twogami takes the fake-dating assignement a lot more seriously, and ends up having a lot of romantic tension with Junko.
Cue major flirting and closet makeouts, with a huge element of the media capturing their 'scandalous' relationship. Imposter ends up having genuine feelings for Junko, and probably opens up to her the most. Junko thinks they're similar, so she enjoys their company.
Then Junko suddenly hosts a killing game and kills herself, completely inexplicably in Imposter's eyes. Because she became Imposter's closest friend and lover, they decide to take up her identity-- both as a way of honoring her, and of trying to spread her goal of 'despair'.
This is where Twonoshima comes in! If you've seen my remnant askblog, you can tell they're basically just Awful Terrible Despair-filled Junko. This is because they're specifically imitating the version of Junko they saw on tv, and not the one they remember from their school days. They wrestle with this role because it goes against everything they believe in-- but they want to do Junko proud.
Unfortunately, this takes a turn for the worse as Twonoshima doubles down on the performance in the face of their classmates' mixed opinions, and seeks to truly become Junko. By the time sdr2 rolls around, they've completely lost sight of their original self, and successfully turned all their relationships into violent, unhealthy wrecks. This is all justified in the name of 'Despair', something they still don't understand or really know how to define.
Or, to put it more simply and in an echo of their words: "Hers was the most absolute existence I'd ever known."
