User blog comment:Rassilon of Old/Young Justice spoilers at Comic-Con 2012/@comment-173.79.14.220-20120916042533/@comment-1038387-20120917123129

This is out of the top of my head:
 * John Stewart/Green Lantern
 * John Malone/Fastball
 * Johnny LaMonica/Black Spider
 * John Constantine
 * John Dee/Doctor Destiny
 * John Corben/Metallo
 * John Henry Irons/Steel
 * John Flint
 * Johnny Stitches
 * Johnny Witts
 * Johnny Quick

And I probably forgot an important one or two.