People; some people; people in general; someone, excluding the speaker.
There (especially as an expletive subject of be).
A single person, previously mentioned, but typically not if previously named and identified as male or female, especially if of unknown or (since 21st century) non-binary gender.
A group of entities previously mentioned.
Their.
The, those.
Me and at least one other person; the objective case of we.
Me.
Our.
Me (in all contexts).
The speakers/writers, or the speaker/writer and at least one other person.