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Otherwise any kind of permanent persona mode would result in a DDS situation where there is no reason to ever be human in a fight.
I wonder if it's gonna be another "just get rid of this persona" situation. That was one thing that kinda threw me off about P4 was Izanagi you pretty much never come back to. I held on to it forever until I realized you just need to get rid of it.
I am sure you will only use that Persona for a bit then get rid of it till you get the super form.