>>716104015The number of playable characters shouldn't matter, more important would be building the world around the feature.
Like, it'd be weird if the witch was a 3 when everyone else were 4s, so they'd either all need some representation among the game's NPCs, or some explanation for why the witch was special.
The forms would also have to somehow affect the gameplay and enough to make trying each out worth it.
So it's certainly possible but probably more work than it's worth given how niche it would be.