Just a list of fandoms I think would be fun here; feel free to add your own 
Angel/Buffy the Vampire Slayer
Better Call Saul/Breaking Bad
Chilling Adventures of Sabrina/Riverdale
Dark Crystal
DC
Firefly
Harry Potter
Hunger Games
In Time
Inception
Mad Men
Magicians, The
MCU
Ranch, The
Star-Crossed
Star Wars
Stephen King's creations
Stranger Things
Travelers
Umbrella Academy
X-Men
Angel/Buffy the Vampire Slayer
Better Call Saul/Breaking Bad
Chilling Adventures of Sabrina/Riverdale
Dark Crystal
DC
Firefly
Harry Potter
Hunger Games
In Time
Inception
Mad Men
Magicians, The
MCU
Ranch, The
Star-Crossed
Star Wars
Stephen King's creations
Stranger Things
Travelers
Umbrella Academy
X-Men
