JJ

JJ is a alien from Cygnus 4019 who was forced to be a part of The Gang by Rex Luthor. Though like Rex JJ was made by The Hypercube

Becoming Joker Jr
After being made by the Hypercube he lived on Cygnus 4019, within a school away from any parents which mainly teached children by making them watch what went on, on Earth. At this school JJ was roomed with Rex,

The Super Sons
At the end of the summer JJ was pulled into the Hypercube with most of the others Superboy and Robin had met, since then he's been having his own adventures mainly fighting Rex on repeat.