more on tsumugi -- i went into v3 blind, but i was hooked onto miu and tsumugi immediately, so when tsumugi suddenly clocked miu TWICE in chapter one i was thinking, huh, she talks about miu as if she wrote her! lol! and then i spent free time events with her and kept paying attention to what she was saying during the game and i started suspecting that she's up to something pretty early on (i think around chapter 3?)
so the payoff felt really good to me. my suspicions were right. tsumugi isn't that big of a surprise if you actually paid attention to her. again my biggest tip off was how she talked about miu, and how she literally gets Angry at shuichi in her fte when he insists that she's not plain. that set off alarm bells in my head, because like, why does she WANT to come off as plain so damn bad?
and that happens early on in the game so i think its less of "tsumugi is a bad twist villain" and more of "if you pay attention to her shes a good twist but a bad villain" ykwim