[quote=@Retired]She was actually an anti-hero long before Harley Quinn. She'll kill to protect nature, but she has no desire for common crime or fighting the bat.

As for why I personally don't like over-grouping (keeping in mind I have zero say and this is just my thought), on a narrative level it stops the world from being fully developed and on a mechanical level it more often than not results in dead games due to lack of diversity. 
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Not to mention generally overwhelming the parent character's player with ensuring everybody is happy and able to work with what they've setup.