Edit: Also, it's kind of odd how the mute protagonist here is basically a secondary character so far. Everyone generally interacts with Elma, rather than the avatar, even for long speeches and such. There was a mission where the party reunited afterwards and everyone was randomly saying that they won only thanks to Elma, even though she didn't do anything special there in the cutscenes aside from being a party member.
But then in some sidequests, like H.B.'s 1st Affinity Quest, the mute avatar is suddenly the protagonist and people actually mostly interact with them in the cutscenes...