One of my mad scientist roleplaying characters' assistants is a 16-year-old half-Chinese orphan (unknown white mother, Chinese father). She was (I decree by fiat) mostly raised by her now-dead father, who was a sailor. She is fluent in English (or at least enough so not to impede communication), but likely speaks at least some of whatever her father spoke.
She was taken in by my mad scientist shortly after her father's death (when she was ~12), though said mad scientist is only 7 years older than her. She is now the resident math genius. So is there any particular mode or method of address she might use, or would she most likely call her boss Miss Lastname like everyone else?
(yes, I'm putting *waaaay* too much thought into these NPCs)
edit: The consensus seems to be that she'd call the mad scientist "Miss Lastsname" (or just Miss/Ma'am) like everyone else. I was just trying to figure out if there's anything Chinese that would be likely to be natural and reflexive to her for someone she has a close relationship with, or if she'd just go with the prevailing mode...