52 Shake-Up: Protector and Mas y Menos

The below picture is from the recently released The Multiversity: The Just #1 (October 2014). Multiversity is Grant Morrison's tour through the multiverse, and The Just presents Earth-16, a world that's part Kingdom Come, part Young Justice (the series), and 100% 90s DC. It's a world where our generation of superheroes did their job so well, the only left for the new generation - made up mainly of teen heroes and forgotten 90s characters - is to fight each other and party. They're celebutantes more than superheroes.

This picture is of one of those parties, and you can see some of the members in attendance are Protector (star belt in the middle) and Mas y Menos (far left and far right). Protector appeared as an ersatz Robin in some Teen Titans PSA comics before becoming an official member for one issue, while Mas y Menos are speedster brothers that first appeared in the Teen Titans cartoon before showing up as Teen Titans members during the One Year Gap...also, I think, for one issue. Whether or not these characters exist on Earth-0 is left to be seen, and they probably don't, but they definitely exist on Earth-16, and that still counts.

Edited to Add (7/6/21): Protector appeared on Prime Earth in Heroes in Crisis #3 (November 2018). He died in issue 6, though his most recent appearance was in The Flash #771 (June 2021) as a corpse.