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 see 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 not a lot adapted.
If not, an original mythological world LCG from FFG directly would make the work ^^ And still want a coop version of Star Wars ^^