Okoye didn't have a daughter.
I hear you on the rest, which is why I ask, who would make sense to add.
N'Kano/Vibraxas played by John Boyega
it would have been cool if N'Kano/John Boyega had just a small cameo role in the first movie as one of the young warriors that declined to challenge T'challa at the first warriors fall fight in the beginning of the movie you know just a small cameo wink wink role to be expanded on in later movies
he could kinda be a T'challa/black panther fanboy potential miner sidekick type character and maybe a possible love interest for shuri
Powers
N'Kano is infused with Vibranium. He can create and control vibrations which can manifest in different ways including destructive shockwaves, subtle frequency matching, and phasing himself and others through solid substances.
Vibraxas must wear a harness to help control his powers & regulate the energy he releases so his bones won't shatter.