You have a natural ability to impress and lead others. Anyone can acquire a semblance of charisma through looks, manners, and intelligence – but real charisma is independent of these things. Each level gives +1 on all reaction rolls made by sapient beings with whom you actively interact (converse, lecture, etc.); +1 to Influence rolls; and +1 to Fortune-Telling, Leadership, Panhandling, and Public Speaking skills. The GM may rule that your Charisma does not affect members of extremely alien races.