Hello anon!!! To be fair I have no other advice rather than doing what you like to do!! Whenever I write them I just take a look at their personalities and then I sit down, ideas in my head and I close my eyes, letting my mind visualize everything and if I see Neuvi and Wrio fitting on the context I just don't think and write!! I let them tell the story on their own, I'm just the medium to put those words into being :>