Actually that was Cassie. Donna has black hair. 

I'm only hesitant on Mary because of her power-set. It just makes her the Superboy of the team. Though Mary fits a naive, innocence that beguiles her ability as a hero. 

I like Canary in the role just because she's more a take charge and tactical role. She's bubbly and energetic like Ollie. 

Anissa Pierce, Daughter of Black Lightning. Just because she's obscure and needs attention. lol

Terra is another thought purely for the fact that I like her in new 52 and not Judas Contract when she's sleeping with Slade. 

And Donna...Donna is weird. She's an afterthought

Sorry...I'm rambling. :P. Just in a very happy mood this morning and thinking quite a bit. :sun