How to fix warped legs of Rigify integrated MMD models
You can fix the model in either PmxE or Blender.
You have to disable Local Axis for these bones (the ones with āDā).
If anybody had trouble with UuuNyaa Tools Rigify Integration, this video shows how to fix the models.
Rapi from Nikke and Dehya from Genshin are the known examples.
credit: Rapi (Nikke)