Wonder Woman. Just generally iconic and I love it when she has that dark wavy hair look. I think her movie costume looks great and I hope she does well. Leader material!
Storm. Always a favourite of mine since the 90s cartoon. Can flight and control weather and shoot lightning? Nice yes! AND COOL WHITE HAIR! A true leader.
Cat Woman (if she counts sometimes at least). Always cool and sexy and I like cats and is Batman's true love!!! lol Not quite leader material or superpowered, but I figure she's special somehow.
Runners up who I also like in general:
Barbara Gordan Batgirl and Supergirl. Cute and stylish girls!
I also thought Wondergirl (Cassie Sandsmark?) in the Young Justice cartoon was super cute. What makes her actually different from supergirl though? How do I know? Are they the same person? lol Apparently they aren't...
I also like Zatanna design-wise but never thought much of her powers or personality.
Also from manga/anime: Lina Inverse. Chaos and fire-powered sorceress with bombast. lol I didn't know she was in GranBlue Fantasy, but I like that she got nice new official art of her made!