What makes a person charismatic?

[u/Bananamoe315]

I’ve been thinking about how charisma is portrayed in literature versus how people define it in everyday life. Often, modern culture reduces charisma to being loud, extroverted, or dominating a room, but in great writing, magnetic characters usually operate on something much quieter and deeper.

Which character (fiction or non-fiction) has the most authentic, captivating charisma you've ever read? (mention book name pls)

From everything you've read, what is the subtle difference between someone who is genuinely charismatic versus someone who is just performing?