Avengers: Infinity War - Predicting All 76 Characters
55. Nakia (Lupita Nyong'o)

Status: Unconfirmed
Given that she's T'Challa's love interest in Black Panther, it seems illogical that Lupota Nyong'o's Nakia won't be sitting at his right hand (and fighting alognside him, Okoye and Shuri) when the action turns to Wakanda.
Unlike the other two, she's not yet confirmed, but it seems unlikely she'd be left out unless she's killed off in Black Panther.
54. W'Kabi (Daniel Kaluuya)

Status: Unconfirmed
Daniel Kaluuya's W'Kabi is in a more precarious position than some of the other Wakandan characters as he's going to be protecting T'Challa in Black Panther and the rule of escalated drama should put him in harm's way. But, if he survives that movie - and let's not forget that Marvel doesn't like casually killing characters off - he should also be back to defend his homeland in Infinity War.
You don't waste acting talent this good on throw-away supporting roles, after all.
53. Queen Ramonda (Angela Bassett)

Status: Unconfirmed
As the only other member of the Wakandan royal family - who finds herself kidnapped in Black Panther by the look of the trailers - Queen Ramonda should also return alongside her son and daughter. She surely can't also be killed off when T'Chaka has only just met that fate?
52. M'Baku/Man-Ape (Winston Duke)

Status: Confirmed
Curiously, Winston Duke's secondary villain M'Baku - who appears to be the head of a rival tribe to T'Challa's ruling family in Black Panther - was one of the first supporting characters to be confirmed for Infinity War.
Presumably, he's not killed for kidnapping Ramonda, Nakia and Everett Ross in the stand-alone and will eventually see the value of teaming up with his new king to help defend Wakanda.