A no brainer of an addition and easily one of the most ready to spin-off into a potential franchise. T’Challa is king of a technologically advanced African country that has isolated itself from most of the world. Being a modern king he was educated in his tribal ways but also in the outside world. He is also one of the smartest men on the planet. Adding some color to the team is definitely a plus but the man has resources even Stark doesn’t have. Can replace Hawkeye or Cap.