As a new propertie, I would say the Riordan world for coop LCG ( Perçy Jackson, Heroes of Olympus, kane chronicle ). Why ?? For many reasons, it would work a lot. Firstly, a lot source materials, in the books and in the mythology from which they are adapted, with differents feelings as in the different myths. Then, a lot of characters for being playable, with the differents youngs people in the colony of half-blood. So much ideas for confront the different gods, monsters in a modern world, a lot of artifact, and at the end, the way to use a popular property, that would draw the attention of more young peoples, and the way for FFG to adapt this world in his own way, let us s ee original monsters and gods and places not looked at in the books. That would be a very good idea, as this property is very popular and no t a lot adap ted.
If not, an original mythological world LCG from FFG directly would make the work ^^ And still want a coop version of Star Wars ^^