Alanna Mosvani will be played by Priyanka Bose.
Maksim will be played by Taylor Napier.
Ihvon will be played by Emmanuel Imani.
Alanna is an Aes Sedai of the Green Ajah who has a significant, and sometimes controversial, role in the story. Interestingly, in the books, Alanna has two warders, Ihvon and Owein. Of those warders, Owein has the lesser role and is only mentioned a few time before dying. It seems he’s been replaced by a character named Maksim. It’s unknown if these are intended to be the same character, or if Maksim is a replacement for Owein with the intention of having a larger role.