When I’m writing character interactions between my OCs, I sometimes find myself writing them as caricatures of how I planned their personalities - writing them how I remember them rather than checking what exactly I wrote down in my notes. While this is fine, it is good to recheck what I originally planned so I can improve my accuracy. I do a similar thing when drawing character designs. You plan everything about how a character looks and you draw them in a pose without looking at the reference. You forget things, remembering the basics of how the character looks but forget some of the details - for example, my sona’s wings or pauldron. But over time, as you draw them more, you remember those details. You draw a completely accurate design true to what you planned, and it’s tweaked to fit the materials you work with, changed a little to the original and better now. Apply the concept to character writing. You type out little scenarios with the same OC interactions characters and it’s not true to form to begin with - but you do it more and you get better until you land on a design, a personality, a way of speaking that you’re happy with.
Now if only I followed my own advice and wrote character interactions in the same way I keep drawing my sona