synodiporia might float your boat - the premise involves visiting a number of AUs, but you don't have to fit your character to the AU settings if you don't want to. Otherwise it hits all your requirements.

Even castmates of one form or another! The only Star Wars we have at present is Jaina Solo; YJ-wise there's Zatanna and I believe Dick, and... if you happen to play from P3P, we have a Minako who'd love to have another SEES person around, especially one who knows her.