If the main OCs in this story were voiced, what would they sound like?

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If it’s the humans you’re talking about then I can try to paint a mental picture:
Zeko- Physically stunted as if his puberty didn’t finish so his voice is higher pitched for a boy but still has masculine tones
Kotetsu- Rough voiced, a bit manic in his speaking
Nouka- Childlike in manner but has a fairly masculine tone of voice
Shiro- Rough voiced for a girl, speaks like a city dweller in abbreviation

If you’re talking about the OC MLP characters then say so and I can get into that as well