Black Panther has no shortage of great talent already signed; Chadwick Boseman will return as the heroic T'Challa of course, but there's also Lupita Nyong'o, Michael B Jordan, Andy Serkis, Forest Whitaker, and Martin Freeman to take into account. And this week, the movie added Emmy winner Sterling K Brown.
You might recognize Brown from the NBC show This Is Us, or as Christopher Darden from The People vs. OJ Simpson: American Crime Story - the role which nabbed him the aforementioned Emmy. In Black Panther, he'll be playing N'Jobu, who is described as "a figure from T'Challa's past."
Personally, my guess is one of two roles: either N'Jobu will fill the void of Storm's mother, N'Dare, or his advisor, N'Gassi. Storm was married to Black Panther once upon a time, but since the X-Men don't exist in the MCU, rewriting N'Dare to become N'Jobu and fiddling with this part of T'Challa's backstory would make a certain amount of sense. N'Gassi, meanwhile, is a character who served as advisor and right hand man of T'Challa, like a not-evil Jafar from Aladdin.
