Caballero Luna
The character first appeared in "Werewolf by Night" #32, in August 1975, which also featured the first appearance of Moon Knight. The character would next appear in "The Defenders" issue 49, in July 1977, becoming a recurring character in the 1980 "Moon Knight" series, and the 1989 series "Marc Spector: Moon Knight". The character also played a significant role in the 2006 "Moon Knight" series and was also featured in the 2009 series "Vengeance of the Moon Knight". The character would later reappear in the 2016 "Moon Knight" series where he is one of the mental patients in an insane asylum in New York City alongside Marc Spector, Bertand Crawley, Gena Landers, Marlene Alraune and others.