Batman was Green Grenade's sponsor for Hellfire, he was leaving for vacation just before the reboot but he'll be returning. [s]Another option could be the Ted Kord version of Blue Beetle, who had his own Kord Technologies.[/s] You don't have to have a stealthy mentor, or be like your mentor in any way if you don't want to. Ditto only has the whole being alien and looking human thing in common with Superman.

~KL~