A Lords of Gossamer and Shadow game, based around characters from a mutual shared gossamer world.
"Lords and Ladies of Gossamer, are quirky idiosyncratic things. They are not bound to blood line, or a musty ancestral throne for their power, but distinct and possessing individual drive and character so as to worthy in their own way of initiation into the greater mysteries of the long and winding stair. While there are 'Sovereigns' and even a 'Court' at Vala's Holding at Shatterlight, there are countess worlds but, only a finite number of Ladies and Lords of Gossamer."
A common World creation is part of the character creation process.
Themes to think about:
What makes this world your character's home?
What ties does your character to your cohort?
What distinguishes your character to have reached a higher state of being?