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Harley Quinn certainly has been considered part of queer pairing with Poison Ivy by most fans based on the animated version of the character and some moments like this from Gotham City Sirens.
In the semi-annual couple’s tournaments I’ve held Harley/Ivy is much more popular couple than Joker/Harley.
But in the new 52 Ivy was off in Birds of Prey while Harley joined the Suicide Squad. But now with her own book, the two have been reunited and the innuendo moves into canon category.
So if you haven’t read this realize there is material from Harley Quinn #2, below.