Sokka: Why's everyone looking at me? Aang: You're the idea guy. Sokka: So I'm the only one who can ever come up with a plan? That's a lot of pressure.
~ Aang telling Sokka that he's the brains of the group
A heroic individual who has super high levels of intelligence and chooses to use their gifts for good rather than evil. They are basically the heroic equivalent of the Doctors and Scientists or Mastermind archetypes. Genius often goes hand in hand with Wisdom but a genius is not necessarily a wise hero and vice-versa. The key difference between a wise hero and a genius is a genius will have the knowledge to do amazing things but a wise hero will be able to apply the knowledge they have with ease and is rarely wrong. Even the smartest of heroes can potentially be naive, or absent-minded.