Who's This? A shape-changing Legionnaire.
How you could have heard of him: One of the most recognizable Legionnaires, Cham could still be seen with the team in the recent Doomsday Clock event and Bendisboot, as well as on different cartoon shows, not least of which the LSH's own series' second season. Resident Alien fans might like to know he served as aesthetic inspiration for the comic's (less so the TV show's) title character, according to writer Peter Hogan.
Example story: Legion of Super-Heroes #301 (July 1983) "Different Paths, Different Dooms" by Paul Levitz, Keith Giffen and Larry Mahlstedt
In this story, we have some of the elements that made me like Chameleon Boy in the first place. He's a wiseacre, he's naturally good at adapting to different situations, and though the rest of the Legion isn't around, he FEELS like a veteran and a leader. Later iterations of the LSH turn him into a weird outsider, and that had appeal too. He's probably too "human" in the original stories. But hey, that's when I cam into things.
Who's Next? A shape-changing Titan.