"How dare you breathe in my prescence mortal"-energy.
She may seem harsh at first, but she's nice once she deems you not a threat.

She will not hesitate to step on you.

Her backstory is practically non-existent, but the general vibes go something like this:
She's a warrior or soldier, and in her waking life her "job" is to keep her body and mind in shape, and while she's asleep her soul goes off to work or something.

In other words, her soul has seen a thousand battles, while physically her body hasn't.
She does not remember it when she wakes, only a few strong emotions and vague memories -- akin to a dream you've forgotten -- remain.