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Or they could just rewrite him to be mono in the first place, just like the other 7 romance companions. Solves this issue with it.

Uh, no, that would not solve the issue. That's like saying the answer to less than ideal queer rep is to make the character straight instead. You said it yourself- the other seven characters are primarily monogamous. If monogamy is so important to you, you can romance them instead of taking away the ONLY representation poly people have.


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All the more reason his romance just needs a proper rewrite.
This has nothing to do with wanting Halsin to conform with traditional values, so no, rewriting his romance wouldn't fix this. I want Halsin's trauma to be acknowledged, not for him to abandon the values he grew up with.

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I think you'll find that sufficient arguments have been given here to have these interactions entirely removed, not further expanded upon. It doesn't fit the narrative for any of the characters in the slightest, including Halsin himself, and rewriting them to a point where it does would require infinite time and effort, and likely ruin their actual romance in the process. Considering how incomplete some romances already feel in act 3, if they were to do anything, they'd be better off spending their time working on their actual romance while giving Halsin a better mono romance that doesn't require complete rewrites or character assassination of other companions. Not this out of character side story arc they've thrown in for them at random that at the moment is thankfully all but fleshed out (less than 5 minutes of dialogue with no consequences).
On second thought, I've changed my mind- I now want EVERY character to be open to poly with Halsin and all of them to live together in a giant polycule in the epilogue.