But then how is it written in Hiragana or Katakana? The sound isn't represented in their alphabets to my knowledge, so they must write it in a way that also makes that phonetic alteration to the name, right?
Yes, it was definitely a mistranslation. Kingdom Hearts is correct calling her Aerith.
No, it was NOT a mistranslation, and Kingdom Hearts only called her Aerith as fanservice.
I'm really indifferent on the matter.
*Poll Option Under Construction*
But then how is it written in Hiragana or Katakana? The sound isn't represented in their alphabets to my knowledge, so they must write it in a way that also makes that phonetic alteration to the name, right?