What is an interesting person?
I guess when I start to think about that, I think of things that I like to do. I actually don't think I am interesting, although some of what I find interesting about others also applies to me. What is not so interesting about me is that I don't have a lot of varied work experience outside of academia.
An interesting person will know languages, music styles, will have traveled a bit. Have a wide range of interests, exploring some of them with some degree of depth. They will have interesting minds and varied life experiences. They will have read a lot and thought about what they've read.
I guess, too, being interested in other people. Narcissists are not interesting, nor pontificators.