Just for fun, a quick photoshop as Smith as Mar-Vell.
As for the part being too small, (I have had many ideas for this movie),
It would be like Terminator with his part being like the Kyle Reese part.
He comes to Earth to either outrun or stop a rogue Kree cell lead by Yon-Rogg. On Earth he partners up with the star of the movie, the Sara Conner part, SWORD agent Carol Danvers. She and Mar-Vell stop the Kree terrorist cell but not before Mar-Vell must sacrafice his own life to stop them. Part of this is giving his powers (and high tech armor) to Carol. She uses them to stop the Kree cell and their secret weapon, a Kree Sentinel, once and for all.
With the Kree being in the GOTG movie, Mar-Vell's role in the Marvel movie universe would be pivotal and make his one movie appearance so important. He would help bridge the gap of the Avengers, Agents of SHIELD, and the GOTG. And lead Carol Danvers into becoming Captain Marvel, Marvel movies female Thor/Captain America type and their first big time female hero on the level of Thor or Hulk.
He could also reprise his role for a flashback when they need to reveal that he had a child with the Skrull princess, and maybe his own son could play Hulkling if his acting becomes better.
I also have idea on the costume:
Also, tangent,an idea I had that may be good or not but what do you guys think of the idea that the Kree have been guiding Earth all these years?
Like helping Erskine create the Super Soldier Serum, maybe getting the Cosmic Cube on Earth in the first place,
sort of setting players up like in Chess to get Earth where they want it to be. (not based on any evidence from the movies or shows.)
