It's hard to say for sure. The Joker's feelings for Harley Quinn vary depending on the comic and the writer. Sometimes it appears as if he loves her, but it's often a toxic and unpredictable connection.
The emancipation of Harley Quinn has been depicted as a comic. It explores her character development and story in that medium. There are various storylines and art styles that contribute to the overall narrative.
Harley Quinn's sexuality in the comics isn't strictly defined as gay. It varies across different story arcs, with her showing interest in characters of various genders.