The Legionnaires: And the Rest
Let's face it. Some of these people were just names on a list, and maybe the best thing to do would be to get 'em all out of the way now.
Echo aka Myke-4 Astor of Khundish Calish-Aetia. Created by Jim Shooter and Curt Swan.
Crystal Kid aka Bobb Kohan of Earth. Created by Gerry Conway, Steve Ditko, and Robert Cohen.
Storm Boy aka Myke Chypurz of Earth. Created by Jerry Siegel and John Forte.
Porcupine Pete aka Peter Dursin of Earth. Created by Cary Bates and Dave Cockrum.
All four of these guys were Legionnaires during the Five Year Gap, and their tenure with the team has been almost completely undocumented. They each had some history outside of their Legion membership, too: Crystal Kid was a longtime Academy student, Storm Boy was a Silver Age reject, Echo was a villain in the Adult Legion story, and Porcupine Pete was a Sub. They also got a little bit of play in the 5YL era, but nothing to excite anyone's imagination. Oh: Echo and Storm Boy were also brought back as villains by Geoff Johns, and Porcupine Pete was the leader of the Subs in the animated series.
There's nothing wrong with any of these characters. I'm sure a good writer could make something of any or all of them. As it hasn't happened yet, I say that we move on.