I would definitely suggest playing around with styles and perspectives! I've had to do that with a few of my characters to really get their voice to fit.
For example - with Psyche, I played around briefly with present-tense third person. It didn't fit her at all. But when I did it with Quilyan, it was perfect for him. Those were the voices that they wanted to speak in. I think a lot of it almost subconsciously has to do with their personalities - both of them are more withdrawn and don't really talk about emotion and whatnot, so it doesn't necessarily show through in an obvious way in my writing. It's a lot more subtle.
But with Sohalia, I started her in third-person and ended up with no muse for her. She's such an open, honest, sweet character that third person severely restricted her personality. But immediately when I switched to first person, she became my second most played character after Psyche.
Maybe I'm crazy drawing a link between personality and writing style, but it's just my perspective on stuff.
Something I suggested to my sister is coming up with a situation and writing out several responses to it - try one in third person, try one in first person, try one in present tense, past tense, whatever - try all different combinations until you find what feels 'right' for that character. And keep in mind that your characters don't all have to be written the same - the variation is what makes them all unique!
Hopefully this helps <3
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