so far batman and the joker have "canonically" been:
hero and villain
villain and hero
hero and sidekick
mug-ee and mugger
Arkham attendees
possible biological brothers
the same person
husband and wife
son and mother
baby and adoptive father
father and biological father of the same child
bisexual Spy and bisexual Spy-ee
homoromantic Legos
dinosaurs






















