Chameleon (comics)
The Chameleon was born a Soviet citizen named Dmitri Smerdyakov (Дмитрий Смердяков). In his youth, he was a servant and half-brother to Sergei Kravinoff and eventually became a minor associate to Gustav Fiers. Although Dmitri and Sergei were friends, Sergei was often abusive to Smerdyakov, leading to a combination of admiration and resentment towards Kravinoff. Eventually, Smerdyakov emigrated to the United States of America. As he had made a talent for himself during his youth, impressing his brother by impersonating friends and neighbors, he assumed an even more impressive disguise: the identity of Chameleon. During his first known criminal outing, he impersonated Spider-Man, though he was exposed and arrested. Shortly afterward, Kraven the Hunter himself came to America, and the Chameleon set his old associate's sights on Spider-Man. Both men became long-time enemies of Spider-Man, part of his primary rogues' gallery.
Ron-Karr
Ron-Karr appears in the animated "Legion of Super-Heroes" television series, voiced by Shawn Harrison. He is seen as a member of Lightning Lord's Light Speed Vanguard group. Unlike his comic book version, the animated Ron-Karr is a shapeshifter and even rivaled Chameleon Boy in "The Man from the Edge of Tomorrow" Pt. 2. While under the employ of Imperiex in the episode "Who Am I?", he was tricked into believing he was Superman which made him question why he was a villain. He wound up betraying Imperiex and helped the Legion stop the missiles headed for Chameleon Boy's home planet Durla.