How can I be charismatic, witty and charming? What are some specific techniques that you use?

How can I be charismatic, witty and charming? What are some specific techniques that you use? These qualities Ive seen in only one person with a slight stutter, so I know it is in some cases, possible. But how? Their is such a small window of time to make witty remarks, be funny or not be awkward. So far the only thing that's worked for me so far as been deadpan comedy or smart one liners. I can never set up a scene to tell an elaborate story or something like that in a group setting. You guys get what I mean. If any of you have overcome this or found a way around, how havr you?