The Mandalorian is being adapted into Manga on May 25, 2022, in the Square Enix monthly Big Gangan 6! This would put this issue in contention for the first comic adaptation of the Mandalorian and the first appearance of many of the Mandalorian characters depending on the individual collector’s definition of a first. (Some dismiss foreign editions and Manga).
Of course, the UK Graphic novel is being published first on May 18, 2022.
Then finally this Big Gangan 6 on May 25, 2022.
Then The Mandalorian 1 from Marvel on July 6, 2022.
Volumes 6 (May), 7 (June), 8 (July), and 9 (August) are going to have Visions adaptations as well: