In the Earth-2 continuity, Thomas Wayne survived being gunned down by Joe Chill, but faked his death convincingly enough that it was only years later, after becoming Batman, that Bruce discovered his father survived, having gone into hiding.
Tragically, Bruce perished defending the Earth from Darkseid, and to honor his son's memory, Thomas Wayne took up the cape and cowl.
Lately I've been craving an opportunity to write this particular incarnation of Thomas Wayne. It wouldn't necessarily have to have the rest of the baggage that comes with Earth-2; it could just as easily be set in the mainstream continuity, with Wonder Woman, Superman, and the rest surviving.
It's a longshot, hoping there may be a group game presently active and accepting new characters/players where this version of Thomas Wayne would fit, but I figure it can't hurt to ask.