Harley Quinn without the Joker is a lame character.
Eh?? TAS did plenty of great things with her sans Joker.
Not to mention she’s been sans Joker for years now and doing better than ever.
To be honest, the best Harley Quinn's ever been is when she has the Joker at her side. Their dynamic is what made her character interesting in the first place. Sure, her solo series in the New 52 and Rebirth is good stuff, but the character is really dependent on the Joker when it comes to her being a compelling character.