Re: what to u is someone's tell-tale for revealing their "character"
Afridi,
I doubt that she's asking you to judge someone without getting to know them.
I suspect she wants to assess them discreetly.
She's asking what signs you would look for in a person's nature to form an opinion about them.
Dushwari,
I think it's very difficult to accurately form an impression about somoene until and unless you see them in trying circumstances.
Perhaps when they are having a particularly difficult day, or when they are frustrated and angry.
If you can tolerate someone when they are in the worst moods/situations, it is likely that you will be able to handle them in good times.