Chameleon (comics)
Created by writer Stan Lee and artist Steve Ditko, the character first appeared in "The Amazing Spider-Man" #1 (March 1963), making him the first member of Spider-Man's rogues' gallery, based on issue publication date, excluding the burglar who murdered Ben Parker (Supercharger was the first Spider-Man supervillain chronologically). He is also well known to be related to Kraven the Hunter. That revealed relationship helped evolve him as a major villain compared to his original depiction of being just a solo villain in the original issue of "The Amazing Spider-Man".
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.