Roxanne is pretty insane, far more than we have seen right now.

Roxanne tribe are all great warriors( thanks to the beast warrior class and animal instincts ) and she herself is even more crazy because she have some scary abilities outside of her class

She among other things can sense the presence of living creatures around her like she is spiderman or something and her combat reflexes are god tier

She honestlly would have costed alot more if not for the slave owner selling her at a lower price (something they only mention in a side chapter with the slave traders POV in the light novel )

he actually realised that our dear MC was far stronger than he appears ( even if that was only half true at the time) from him beating the shit out of the bandits more or less alone.

and sold his best slave for a pretty discounted price to get in good terms with him, witch actually paid off for him in the long run.... But thats still quite a few chapters later in the story.
his second slave, the one you can see in the first picture is going to be an even better investment depending on who you ask, even if she is nowhere near as good at fightning as Roxanne

Then again Roxanne is pretty much a goddess of battle so its not really fair anyway.
