The most interesting ones would be Flandre,Remilia,Reiuji, and Sakuya.
If Flandre were to go,she wouldn't go alone or it would be a disaster for them. Either Remilia or Sakuya would go with her.
If Reiuji were to go,she would haven't be able to go in the first place. The only possible way is if Yukari just use gap on her or she broke the Great Hakurei Barrier.
I think that Remilia and Sakuya should go together,if they were to go.
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Crossover Ideas
AdventureCrossovers ideas My favorite is Persona,and touhou(more specifically touhou music 🎶) Cover art is NOT mine
