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Catwoman and Batman. Harley Quinn and The Joker (later rejecting it). Rogue and Gambit (where Rogue was technically a villain at the start). The bad boy/bad girl dynamic sells books. The problem arises when abuse is romanticized. DC has worked hard to separate Harley from Joker (establishing her with Poison Ivy instead), which marks a mature shift away from abusive dynamics.

The Evolution of Comic Book Relationships and Romantic Storylines Hindi Sex Comics