You know to the guy before me me, id buy a book based on something similar to the YJ Runaways, modernized versions of those old Super Friends characters, JLU and YJ showed it could be done just fine.
As for characters I want to see used
Miss Martian, well I just love her she's one of my favorite superheroines and I really want her to be in things again. I just dread that they would ruin her as they've ruined a bunch of other teen hero's I love
Shayera Thal, I really think Prime Earth need's a Hawkwoman/girl, to me Hawkman is incomplete without a Hawkwoman (and if we just had Hawkwoman she'd be incomplete without Hawkman) They are a pair, I can accept Hawkgirl alone on Earth 2 but I have a harder time accepting just one Hawk on the Main earth.
Kaldur, and Garth, and Lorena, give me some young Aquapeople DC, I like having an extensive Aquaman family.
Golden Eagle, why the hell not
Cassandra Cain, The best Batgirl of them all.
Cyclone, I have a thing for bubbly red headed girls ok.
Jade and Obsidian, I have no freaking idea how but yes.
Kid Devil, He's a lot of fun and I loved his friendship with Miss Martian, I want to see that happen again in the new 52