Harl and Red

I REALLY think that the next Nolan movie should be about Harley and Ivy. Like maybe Ivy's teaching botany at Gotham U, and there she befriends Harley, who's totally obsessed with the Joker and that's why she's into psychology (Even though Mr.J ain't gonna be in the next one). And so they're like homies, and Ivy just goes around being a terrorist when people don't respect Mother Earth. Like blowing up junk and stuff like that. And eventually, Harley's obsession gets the best of her and she dons her costume, yeah and then they're villains together. You get the idea. So yeah....
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Harley and Ivy (c) DC Comics