I find talkative or bubbly people very difficult to write, because I don’t use a lot of words. I’m the quiet sort when not typing (or debating).
My workaround is to ask my very talkative daughter what she would say in a given situation, because she has all the words, even though she is five. Most of the dialogue for Miranda Vallès in my WiP on the forum is based on my daughter’s speech patterns, and when I would get stuck I would just ask her for direct intervention.
When I write children’s perspectives, I try to keep it simple and straightforward. To me, children are curious literalists. But I live with two and see many more on a regular basis, so I can also imagine what a specific child would say or do in a given situation.
That’s actually probably been my biggest help for hard perspectives - to think of someone close to the character, and picture what that person would say or do. It’s gotten me out of a hole time and again.