Before the Superhero known as the Black Panther came into being, the character, T’Challa, was originally going to be called the Coal Tiger, complete with different costume. This is a picture of the original drawing. Ultimately they chose to make some obvious adjustments including covering his face and, well, the rest is known history. A Coal Tiger did show up again as an alternate version of the Black Panther in Avengers vol 1 #355 as a member of the Gatherers, a group of former Avengers from different universes. You can find out more here.
Years later, in yet another of Marvel’s parallel universes (MC2), a new Coal Tiger appeared, this time in an alternate future. Here he was the son of T’Challa, the Black Panther. His name was T’Chaka and he apparently had the power to morph into a feral black werecat with superhuman strength and agility, as well as enhanced senses and retractable razor-sharp claws on his fingers and toes. He ended up joining the new Avengers of that parallel future called A-Next in A-Next #4 (1999).