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Write from their POV This is basically the same solution as everyone else has provided, and can actually be combined with most of them. Pick a scene - be it an out of world interview, or a scene ...
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Source: https://writers.stackexchange.com/a/38507 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
## Write from their POV This is basically the same solution as everyone else has provided, and can actually be combined with most of them. Pick a scene - be it an out of world interview, or a scene you've already written, or a story from the character's past, and write that story from the point of view of your problem character. First Person POV is ideal, because it gets you into their head that much more intimately. Don't worry if the voice wanders at first - it's not like you're planning on publishing this anyways. Continue to explore the character until it starts to click.