Board Thread:Movies/@comment-3048593-20180715232450/@comment-3048593-20180910221323

When Variety got the exclusive scoop on Law joining the cast, they referred to him playing that character.

"Law will be playing Doctor Walter Lawson, a.k.a. Mar-Vell, who becomes a mentor of sorts to Danvers as she tries to figure out her new powers."

They also noted how "Marvel had no comment", but I don't really take Variety as getting things wrong like that, although they might've just jumped to conclusion. Even so, based on the descriptions, I've no idea who else Law could be playing (other than possibly even Genis-Vell).

My guess as to why Marvel or Disney hasn't referred to him as Mar-Vell (assuming that's who he's playing), is to not give the casual audience the idea that he's the main focus of the movie, just because he's technically the title character.