Question: Tenebrous is a fictional character appearing as an enemy of a character created by who ?
Context: Loki is a fictional character appearing in American comic books published by Marvel Comics.  He is the adoptive brother and often the enemy of Thor.  He is based on the being of the same name from Norse mythology.  The character first appeared historically in "Venus" No. 6 (August 1949) and in modern-day in "Journey into Mystery" No. 85 (October 1962).  The character was created by writer Stan Lee, scripter Larry Lieber, and penciller Jack Kirby.  Though normally portrayed as a supervillain, he is sometimes depicted as an antihero. Galactus ( ) is a fictional character appearing in American comic books published by Marvel Comics.  Formerly a mortal man, Galactus is a cosmic entity who originally consumed planets to sustain his life force, and serves a functional role in the upkeep of the primary Marvel continuity.  Galactus was created by Stan Lee and Jack Kirby and first appeared in the comic book "Fantastic Four" #48, published in March 1966. Aegis is a fictional character, a cosmic entity appearing in American comic books published by Marvel Comics.  The character is usually depicted as an enemy of Galactus.  Created by writer Keith Giffen and artist Andrea DiVito, the character first appeared in "Annihilation: Silver Surfer" #3 (Aug. 2006).  She is a member of the Proemial Gods and an ally of fellow member, Tenebrous. Damon Dran is a fictional character appearing in American comic books published by Marvel Comics.  Primarily an enemy of Black Widow, the character exists within Marvel's main shared universe, known as the Marvel Universe.  Created by writer Gerry Conway and artist Gene Colan, the character first appeared in "Daredevil" Vol.  1, #92 (October 1972). Tenebrous is a fictional character, a Marvel Comics cosmic entity appearing as an enemy of Galactus. Kaine Parker is a fictional character appearing in American comic books published by Marvel Comics.  The character has been depicted as a superhero and former supervillain who serves as an ally, an enemy, and a foil of Spider-Man (Peter Parker) and Ben Reilly.  Created by Terry Kavanagh and Steven Butler, the character first appeared in "Web of Spider-Man" #119 as the Jackal's first failed attempt to clone Spider-Man.  He later first appeared as the new Scarlet Spider in the "Marvel Point One" one-shot in November 2011 before starring in his own series with the second volume of "Scarlet Spider". Thorn also known as Salvatore "Sal" Carbone is a fictional character appearing in American comic books published by Marvel Comics.  Primarily an enemy of the Punisher, the character exists within Marvel's main shared universe, known as the Marvel Universe.  Created by writer Chuck Dixon and artist John Romita Jr., the character first appeared in "The Punisher War Zone" Vol.  1, #1 (March 1992). Doomsday Man is a fictional character appearing in American comic books published by Marvel Comics.  Primarily an enemy of Carol Danvers, the character exists within Marvel's main shared universe, known as the Marvel Universe.  Created by writer Stan Lee and artist John Buscema, the character first appeared in "Silver Surfer" Vol.  1, #13 (February 1970). Slayback is a fictional character appearing in American comic books published by Marvel Comics.  Primarily an enemy of Deadpool, the character exists within Marvel's main shared universe, known as the Marvel Universe.  Created by writer Fabian Nicieza and artist Joe Madureira, the character first appeared in "Deadpool: The Circle Chase" #1 (August 1993). Graydon Creed is a fictional character appearing in American comic books published by Marvel Comics.  The character was created by writer Scott Lobdell and artist Brandon Peterson.  The character is an enemy of the X-Men and first appeared in "Uncanny X-Men" #299 (April 1993).
Answer: Stan Lee and Jack Kirby