The adopted father of Superman as he appears in Teen Titans fan-fics.
As Jonathan is meant to be the DCAU Jonathan, he essentially has the same personality as in the shows he's appeared in.
Jonathan has no powers other than parental power.
Jonathan is susceptible to anything that can kill a human.
Still alive and now the adopted grandfather of Superboy, Jonathan was asked by his adopted grandson, Conner, to look after a shape-shifting girl named Tina. He assurd Conner that they'd keep an eye on her.