What Happened To Everyone Who Dated Joker?
7. Felua - Legends Of The DC Universe #26-27
Perhaps the most bizarre romance the Joker has ever had takes place in Batman: Legends of the DC Universe #26, where the clown decides to court an Atlantean scientist after managing to convince the inhabitants of the underwater city that he was the 'King of the Land'.
Felua appears to be of interest to the Joker for the very same reason Atlantis itself is - as both are naive to the Joker's villainous ways, and therefore prime targets for him to manipulate as he wants, or finds most hilarious.
This whole mess culminates in the clown trying to poison the inhabitants of the underwater city, only for Felua to still save him from being killed by a mix of Aquaman, some sharks, and his own Joker toxin. As thanks for her efforts, the villain murders her - with Batman discovering her smile-ridden corpse in the final page of issue #27.