Moses Magnum - Jeffrey Wright
Ancestral Plane Bashenga - David Oyelowo
N'Gassi - Wesley Snipes
Aneka - Samira Wiley
Monica Lynne - Janelle Monae
Madame Slay - Aja Naomi King
Zenzi - Naomi Harris
Achebe - Edi Gathegi
Queen Divine Justice - Quevanzhene Wallis
N'Yami/Vibraxas - John Boyega
Mandla - Nonso Anozie
Death Tiger - Michael Jai White
All of that, and more. But yes, if we could also get Denzel Washington in there, that wouldn't hurt me one bit. And this is excluding people who have already been involved in the MCU on some level already.
I could see Wesley Snipes playing Blade in the sequel. Not really sure why Blade would be there or anything but maybe he is there to search for something only Wakandas posess that he needs. With a new updated costume for Blade that would be awesome and a great way to bring back Snipes as his best role and then after that they could make a new standalone Blade trilogy of movies introducing other marvel characters in a Blade movie like Daredevil, Spiderman or someone not used much. Maybe a vampire somehow gets to Wakanda and infects Black Panther or someone important so its up to Blade to help them and also a appearance or two from Halle Berry as Storm who was born in the African nation.
Barkhad Abdi
Nonso Anozie
David Oyelowo
Naomie Harris
Adelayo Adedayo
Marianne Jean-Baptiste
Lennie James
Michaela Coel
Nikki Amuka-Bird
Jimmy Akingbola
Susan Wokoma
Halle Berry
Omar Sy
Viola Davis
Kerry Washington
Wendy Williams
Shereé Whitfield
Denzel Washington !!!
David Oyelowo
Wesly Snipes
Jeffery Wright
Taraji P Henson
Stacey Dash
she was in Luke Cage
No to Eddie Murphy.
I'd like to see Wesley Snipes either as Bashenga OR T'Chaka's dad Azuri.
I don't know the character list of Black Panther too well to name specific roles, but as already mentioned, Mahershala Ali would be good - fan casts have him in Green Lantern, but that clearly isn't happening any time soon.
Also, any movie is better off with Denzel Washington in it.