All of the GLs are white or a big slug.

How about we look at this logically and from the standpoint of the nine major movies, here are the GL's in the game:

• Rey - hero of the sequel trilogy, was in three movies, granddaughter of Palpatine
• SLKR - villain of the sequel trilogy, was in three movies, son of Han and Leia
• JML - the entire series is based on his family, was in six movies, son of chosen one
• SEE - main villain of the prequels, was in six movies, the final Sith master in the Bane line
• LV - main villian of the whole series, was in six movies between Vader/Anakin, chosen one of prophecy
• JMK - master of both Luke and Anakin, was in six movies, one of the top Jedi
• Jabba - unique alien, was in two movies, probably the weakest in terms of iconic character until Ahsoka
• Leia Organa - one of the leaders of the rebellion, in six movies, sister of Luke
• Ahsoka - Anakin's apprentice, in no movies, creation of the Clone Wars cartoon

Notice how 7 of 9 are MAJOR characters in the saga?  That is why they are galactic legends.  It isn't based on race or gender, but to the character's importance to the saga.