Harumi is a woman of an undisclosed age from a far eastern nation called Mizume, she's one of the few real glimpses of "The East" you get to see in my setting. She is a field commander and skilled tactician and swordswoman working for Governor Veltris kurr, a well intentioned man who became a tyrant from trying to save the isles he governed over from catastrophe. 

She stays because she is paid well, but has some honor. She refused to starve civilians into submission, earning Kurr's ire and respect. She doesn't reveal much about her past until a point in book 4. She did the right thing once, but was punished severely  for it. She divides most people she meets into "Worthy" and "Refuse" she finds Wyvern Detachment worthy, but a job's a job, Kurr has told  her they must die, a shame, as she is somewhat of a fan of their exploits. 

She is somewhat obsessed with the story of Tuuli, the blind supernatural swordswoman in the detachment, and sees the young lady's redemption as something that she could've gone through. The world  was to unkind to Tuuli, and yet Tuuli tries to be better, this genuinely confuses Harumi.

She is kind, rather, was kind, until she decided "What is goodness useful for anyway? They will hate you no matter what you do."

Her voice, I'd imagine is silky with edge, even-toned in either a North American sounding accent, or something more Japanese, the culture Mizume is of course inspired by.