If we're assessing character, May strikes me as a mixed bag and I'm hard pressed to form an opinion about her with any confidence.
She's demonstrated honesty, creativity, duty, interpersonal acuity, respect, diligence, responsibility, and endurance. On the other hand, she's impulsive and made one pretty big mistake. Her impulsivity might be controlled by setting appropriate restrictions, and I'm inclined to believe, after all we've seen of her interpersonal growth, that she's learned, despite systematic vengeance, her lesson.
I appreciate, by the way, your abstinence from (mis)characterization;
There's a big difference between being assertive when necessary and enjoying pushing people around for its own sake, and May is very much the latter.
I don't recall any evidence of frivolous commands or manipulation from May, though she is quite brusk. I suspect often that many persons fear admitting the perfectly valid reason of interpersonal incompatibility, against hiring certain persons for certain roles.
It's taboo! It reminds us of prejudice---potential, in oursen---so we grasp for more presentable reasons. It's sad per-se, seeing one hiding one's own self from themself, but it's sad further, when the hiding self-misdirects to believe fabrications. My condolences to such self-mislead, naturally, but their acts and echoes magnify and distort our challenges, embellish fault onto (lightly) dissonant lifestyles; Metaintolerance engendering misconceipt.