Even when a person becomes the Black Panther, the job is not guaranteed to them. Each year on Challenge Day any Wakandan can attempt to best their leader in physical contest.
An Ever-Changing World
For centuries, Black Panthers ruled Wakanda, opting to keep the nation and its Vibranium as much of a secret from the rest of the world as possible. In their isolation and backed by the miracle metal, Wakanda developed into the most technologically and socially advanced societies around, though they still dealt with the kinds of internal strife that comes from any place. Given that secret nature, many of the Black Panthers remain a secret to the outside world, but we do know of T'Konda the Wall, Hu'Nahn the Defiant, Benhazin, Mamadou Fall, Nehanda, Negus and several glimpsed, but publicly unnamed versions as well.
Around World War II, Azzuri the Wise, AKA Black Panther, found himself dealing with the increasingly volatile situation brewing between the Axis and Allies which found both sides attempting to get their hands on Vibranium. During this time he met and befriended Captain America, Gabriel “Gabe” Jones of the Howling Commandos and Namor McKenzie, AKA Namor the Submariner, but also faced off against vile villains Red Skull, Baron Wolfgang von Strucker, Master Man, Warrior Woman, and Tiger Man. While he decided to keep Wakanda out of the war, Azzuri also gave a chunk of Vibranium to Captain America under the promise that he would not explain where it came from to the U.S. government. Rogers did exactly that and the sample was used to create his mighty shield, which has been used to save reality and everything in time and time again.
The Father of Two Black Panthers
Azzuri's oldest son T'Chaka became the Black Panther after him. He married a brilliant scientist named N'Yami who advanced the field of Vibranium research to a great degree. She also gave birth to T'Challa who would become the first Black Panther known to the wider world. Before his son was born, T'Chaka adopted a white child he named Hunter, who was initially jealous of T'Challa, but went on to become the head of the Hatut Zeraze, known as White Wolf. N'Yami passed away a week after giving birth and T'Chaka eventually married a woman named Ramonda, who helped raise T'Challa. She gave birth to Shuri, who also became Black Panther down the line.
T'Chaka served well as king, until a man named Ulysses Klaw demanded Vibranium for his own nefarious purposes. The Black Panther opposed him, but when Klaw aimed his sonic gun at T'Challa and fired, T’Chakabut father jumped in the way to protect his son and was killed. T'Challa attacked Klaw, but the villain escaped. In the wake of T'Chaka's death his brother S'Yan took over because of the prince's youth.
The World Famous Black Panther
Unlike many of his predecessors, T'Challa left Wakanda to travel the world and learn from other cultures. Along the way, he happened to meet a young woman named Ororo Munroe, who would eventually become Storm of the X-Men. This time away gave T'Challa a different take on global affairs than previous kings, who gained much of their knowledge through the Wakandan spy network.
T'Challa eventually returned home and, on Challenge Day, donned a mask and bested his uncle S'Yan, taking his rightful place on the throne as the Black Panther. On that day, Shuri also intended to make her claim on the throne, but was stopped by a very large man being thrown from the ring and landing on her.