T'Challa is the king of the African nation of Wakanda. He is also their protecter as the superhero Black Panther. He was also a member of the Avengers.
T'Challa was the prince of Wakanda when his father, T'Chaka, was killed by Klaw. He became king and took on the mantle of Black Panther.
However, he realized he could not defeat Klaw on his own. He sought out the Fantastic Four and lured them to Wakanda. He fought them seeing that they were all capable warriors. He explained himself and got their help. Together the five of them brought down Klaw.
At some point he joined the Avengers but left. His portrait was in a hall along with several other notable members such as Captain America, Iron Man, and Thor. Some time after, he assisted the Avengers led by Ant-Man.