Koska Reeves is a Mandalorian warrior of Bo-Katan Kryze's Nite Owls, played by Mercedes Varnado in the second season of The Mandalorian. She is introduced boarding an Imperial freighter in the Karthon Chop Fields operation, part of Bo-Katan's campaign to arm a Mandalorian resistance out of stolen Imperial materiel.
She is also the character used to stage the doctrinal argument in miniature: the Nite Owls remove their helmets freely, Din Djarin does not, and the friction between two people who both call themselves Mandalorian is played out largely through her reactions rather than through speeches.
Catalogue entry. This figure has a verified record here rather than a full write-up — the encyclopedia labels its own depth instead of padding it.