I don't know well my friend's new friend, but he seems very shy and kind because (I believe...) he doesn't want to offend or upset people. For example, often he doesn't speak his mind, also in very little things (his opinion about a movie for example) because he fears people don't agreed or get upset.
For what I've seen (and what I know about personality behaviour) he gives me the impression that everything he does/talks with others, he thinks: "What people will think of me? Will they get upset? Will I do bad impression?" So he is always silent or accomodating, at least with people he doesn't know well...
I am interested by that.
I think it's mainly a Jung Feeling function issue. But Fi or Fe?
And in the first/second function or tertiary/fourth goes "wrong"?
What do you think?