Something like charisma cant be understood by using just logic. Its a feeling which is naturally expansive, hot and positive and people pick up on it instantly because its primal/emotional. Its the combination of a strong will (power) and positive emotions. A super strong willed, negative person evokes fear in others and a conflict of wills. Using the same power but with positivity and sharing some of the power will inspire others and emit a charismatic vibe.