*Membership spots not really limited!
The Flash (Wally West) - Former New Warrior & New Avenger (not Illuminati New Avengers). Best friends with Kyle.
Adam Strange - Guardians of the Galaxy (written like the "Planet Heist" mini, a little like MacGyver in space)
Lady Blackhawk (Zinda Blake) - Invaders during WWII, the go-to pilot in books like Wolverine, Captain America, etc. Later on, a main character in Fearless Defenders.
Green Lantern (Kyle Rayner) - Earth's only Green Lantern, former New Warrior & New Avenger. Wally's best friend.
The Question (Vic Sage) - Loner, conspiracy nut in the MU. Like Batman without the people skills and the money. The lone hero out of a very corrupt Chicago, but will help other heroes on occasion.
Supergirl (Linda Danvers) - Basically Marvel's version of Buffy, the Vampire Slayer meets Veronica Mars. While she fights several threats in her hometown of Leesburg, VA (with an increasing percentage of supernatural threats), she runs into very few superpowered allies. For a short time, she's an "Earth born angel". As she gets older, she runs into characters like Doctor Strange. She has several ties with the members of PAD's X-Factor. Does not wear a costume, just street clothes or specialized gear.
Hawkman ("Carter Hall") - Back to the "Conan with wings" take. Or like Ares. But with the reincarnation aspect in play. When he's killed, he's instantly reborn somewhere and grows up like a normal person, "inheriting" memories of his life on his 21st birthday. I'd take advantage of the history of the MU and show him fighting Apocalypse in Egypt, Sinister in colonial times, the Nazis in WWII, Atlantis at some point, etc. And he doesn't always win, but he has to live with the consequences of his failures. He's able to use what he learns in each lifetime and add it to his knowledge of how to cause destruction, making his mind his most deadly weapon (followed by his mace, flight and enhanced strength, of course). Most of the time, he wears shirts.
Prime (Kevin Green) - He's how "Shazam" (ugh) should be. Think Ultimate Spider-Man set in the DCU with more of an original feel to it. At this point, he's still very young, so there's no team affiliations yet.