Lol, I only have one finished published story unless you count book one of "Damsel in the Red Dress." Well, I have a garbage audio drama, but we don't talk about "Lion Proof" no no no.
I think I write Ghanaian characters because I have a Ghanaian auntie who treats me like her daughter. I think most, though not all, characters I write come from having some particular interest in the ethnicity, even it's only one person from that people group, or a photo I saw that I found pretty lol.
The exception to that being that I have no idea why I chose to have an interest in imagining up girls from the Phillipines when I was younger. I know I wanted something different from China, Korea and Japan, but I have zero idea why I picked the Phillipines lol. Years later, I've met two girls who had a weird amount in common with the character I designed though, it was freaky.
I'm still planning to write one of my Pinoy characters in a comic sometime relatively soon if all goes as planned, but why I invented her will remain a mystery in most respects.
I don't think I have any Liberian or Palestinian characters though, so you're beating me there XD. I have very few characters from the middle east area at all, I'm not sure why. I have one character who's Saudi, Venezuelan and Irish, and I used to have a book series where one of the leads was a black girl adopted by a Saudi family if I remember right, but it's like I thought Saudi Arabia was literally the only country in the middle east or something.