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Interesting tidbit during Iori and Loki's chatting collab. There was a marshmallow asking if Loki can hear an accent when Iori speaks Japanese.
Loki said not particularly, but maybe she's gotten used to the foreign intonations because of Clara. Iori then said that she doesn't mind having a jp accent while speaking English, but she'd be distraught if she developed any sort of accented japanese. In her own words it would be like "a drop of blue mixing with pure transparent water or getting a curry udon stain on a white shirt"
Loki accepted her reasoning despite not really agreeing with it, and Iori pulled back a little explaining that she just really likes Japanese and she also feels like she has to protect it (and presumably, her self identity) from eroding since she only ever gets to speak it with family.