It's hard to top Artemis. Her family dynamics and story are interesting, cute design and the VA for her just work and she just ultimately has more screentime than anyone else who could possibly top her.
As for Zatanna. I have No clue why Dick would give up Zat for Babs. She was a total babe, with maybe some daddy issues but what superheroine doesn't? That Dr. Fate/Zatara storyline was a tearjerker for me and one of the best moments of the series, emotionally, imo. It's hard to see her so devastated. >>108038138
Gotta be the must fun in bed. So hot and also a bit terrifying. Roy was on a fucking rollercoaster.