Katrina McCain used be a rich only child. After being driven from her home after her mothers disappearance; She lived on the road for a year or two which toughened her up to be more tomboyish and more stubborn in her nature.

Shes a gunslinger, doesn't take no lip even though with Jets silly jokes drive her up the wall with his singlemindedness. She does her best to help out. Sometimes feeling like a burden to our other two heroes, she goes through an arc through the beginnings of later chapters which lets her shine more as both as badass "girlboss" as readers call her.

Its up to interpretation with how she sounds, but I always pictured her as the stubborn girl-friend (platonic) who gets things done even if she can't see the picture. But hidden inside is still that prim and propered young lady, So perhaps more english sounding with an accent?

I'm up for anything really til it feels like it fits her character lol

This is a link to the Globalcomix page. The voice over role will only cover the First Chapter as an Audio/Comic Dub. 

https://globalcomix.com/c/jetx

https://globalcomix.com/c/jetx/chapters/en/1/1