Assuming the Bat-Family is in the box of main characters… Mera and Carol Ferris/Star Sapphire (non-possessed version).
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Power Girl
The Question
Mr. Terrific
Hawkgirl
Hawk & Dove
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Also add Green Arrow & Black Canary to that list.
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Swamp Thing, Zatanna, Shazam, Green Arrow
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Black Canary
Wildcat
Dr. Midnite
Kyle Rayner
Question
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Shazam, and if Nightwing is not a main, then Nightwing.
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Nightwing
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Shazam! 
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I have to agree with my buddy, @WhySoSerious_Lo, Shazam is the guy!
On a personal side note, I want to say that Nightwing, as awesome as he is, is now very hyped up so I don’t think he is an outside of the box player anymore. Nightwing is a main eventer now! 
Huntress (Helena Rosa bertinelli), Big Barda, Roulette, Star Sapphire, Zatanna, Mister Miracle and Stargirl. So many more, 7 was the minimum for me. I gotta mention elastigirl, plastic man and power girl too so I guess 10 is my minimum but there’s so many more I would include.
Guy Gardner
Booster Gold & Blue Beetle (tie)
Elongated Man
Cassandra Cain-I loves watching her progress through her own Batgirl series. Always felt she deserved a bigger role in the Batman universe honestly.
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Even though he’s technically not a super hero, since he is on Suicide Squad, I’d have to say King Shark.
Hawkman, Atom (ray Palmer) , kord and booster, elongated man
JSA as well
Midnighter