Some people have a much stronger chi/energy than others and you will notice something changed as soon as they enter a room. That can be positive or negative of course...
If you are a person that is much more sensitive to energies and spirits to begin with, this is a good explanation why you felt that charismatic person's energy so strongly. It seems like it's a positive vibe, so I'd try and see if friendship might something to pursue, as well. Oh, and I'd find out if maybe the reason why that person keeps appearing in your presence might be that they feel the same from you? Never know... I feel lots of strong chi coming from people that are just as sensitive as I and we usually connect well... blessings!