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4. Old Flames
Before I talk about these characters, disclaimer: These would all be cameos. One of the biggest story threads that has followed Robbie’s Harley Quinn in her DCEU history, thus far, has been her unhealthy attachment to Jared Leto’s Joker. I don’t think I’d like to see that fully-fledged in a Gotham City Sirens movie; we saw enough in Suicide Squad. But what about a Joker cameo? Jared Leto’s appearance in that other sympathetic villains movie was basically an extended cameo. Could he come back for a scene or two, where he confronts Poison Ivy as she tries to get her red and blue friend out of the emotional clutches of the clown?
The other two characters that could make cameos are Selina Kyle’s past rooftop love and Harley’s potentially future one. Batman and Deadshot could also pop up here and there to show the extended universe is exactly that: actors fulfilling movie appearance contracts. Hey, Will Smith isn’t against the idea.
