Tox-Quinn

The Joker has had a number of lovers and girlfriends over the years, who were as devoted to him as could be. Boarding on yandere level, even if they weren't murderous they were crazy for him. The Joker has been also known to create a number of variants to his famous Joker Venom, most letal but some not. Some only making the victim as mad as the Joker, Jokerizing them if you will.

The two of them couldn't be connected, could it?

Could the Joker have created a love potion or aphrodisiac which makes a person imprint on someone else, causing an insane and intense love where they would do anything for their 'Puddin'? Why not? Love can be consider as both a type of madness and a kind of joke.

So somehow, this Tox-Quinn has found it's way out of the Joker's hands. Instead landing in someone else hands. Someone like...