Once again, here's a list of where all the comic book elements in a Marvel Cinematic Universe originated from. Corrections & additions are always welcome! My master list is kept here.
Jason Aaron: co-creator of Doctor Strange wearing a buttoned-down version of his blue shirt (Doctor Strange #1, 2015); of Thor having a sister he didn't know of (Original Sin #5.1, 2014); of Thor with his hair cut short (The Unworthy Thor #2, 2017)
Chris Bachalo: co-creator of Doctor Strange wearing a buttoned-down version of his blue shirt (Doctor Strange #1, 2015)
Daniel Berman: co-creator of Fandral and Hogun perishing in the events of Ragnarok (Thor #82, 2004); of Thor losing an eye during the events of Ragnarok (Thor #84, 2004); of Thor permitting Surtur to destroy Asgard so that he could vanquish a greater threat; of Volstagg perishing in Ragnarok (Thor #85, 2004)
Robert Bernstein: co-creator of Frigga, queen of Asgard, mother to Thor & Loki; of the Valkyrie, an order of Asgardian warrior woman who ride flying horses (Journey into Mystery #92, 1963); of Thor's ability to channel lightning through his body even when separated from Mjolnir (Journey into Mystery #93, 1963); of Loki trying to usurp Odin's throne (Journey into Mystery #94, 1963)
John Buscema: co-creator of Ultron, the Avengers' enemy (Avengers #54, 1968); of Quinjets, the personal aircraft of the Avengers (Avengers #61, 1969); of Odin having only one eye (Thor #274, 1978); of Gungnir, Odin's great spear (Thor#275, 1978)
Sal Buscema: co-creator of Grandmaster, a cosmic being dressed in yellow clothes with pointed white hair and blue colouring; Grandmaster's obsession with games, often pitting superhuman people against each other (Avengers #69, 1969); of Valkyrie and the Hulk as allies (Defenders #4, 1973); of Valkyrie's enchanted sword Dragonfang (Defenders #12, 1974)
John Byrne: creator of Thor called "Odinson" (Namor the Sub-Mariner#13, 1991)
Olivier Coipel: co-creator of Thor with his hair cut short (The Unworthy Thor #2, 2017)
Gene Colan: co-creator of Doctor Strange's Sanctum being located at 177A Bleecker Street (Doctor Strange #182, 1969)
Gerry Conway: co-creator of the Man-Thing, a monstrous character (Savage Tales #1, 1971)
Tom DeFalco: co-creator of the Revengers, a team named in reaction to the Avengers (A-Next #12, 1998); of Mjolnir being shattered by an immensely powerful foe (Thor #388, 1988)
Steve Ditko: co-creator of Doctor Strange, a sorcerer based out of a sanctum in Greenwich Village who wages war against mystical forces of evil; Strange wearing a blue shirt and orange gloves; the Sanctum's window bearing a symbol with two curved lines pierced by a third line; of Doctor Strange's golden amulet (Strange Tales #110, 1963); of Doctor Strange wearing a magical cape (Strange Tales #114, 1963); of Doctor Strange opposing Loki (Strange Tales #123, 1964); of Doctor Strange's red Cloak of Levitation and round amulet (Strange Tales #127, 1964); of Banner transforming into the Hulk during periods of high emotional stress; of the Hulk having a savage or childlike disposition (Tales to Astonish #60, 1964)
Andrea DiVito: co-creator of Fandral and Hogun perishing in the events of Ragnarok (Thor #82, 2004); of Thor losing an eye during the events of Ragnarok (Thor #84, 2004); of Thor permitting Surtur to destroy Asgard so that he could vanquish a greater threat; of Volstagg perishing in Ragnarok (Thor #85, 2004)
Steve Englehart: co-creator of the Black Widow as an Avenger (Avengers #111, 1973); of Valkyrie and the Hulk as allies (Defenders #4, 1973); of the Bi-Beast, a two-headed creature (Incredible Hulk #169, 1973)
Al Ewing: co-creator of Thor having a sister he didn't know of (Original Sin #5.1, 2014); of Loki's headband with horns (Loki: Agent of Asgard #1, 2014)
Ron Frenz: co-creator of the Revengers, a team named in reaction to the Avengers (A-Next #12, 1998); of Mjolnir being shattered by an immensely powerful foe (Thor #388, 1988)
Gary Friedrich: co-creator of Hulk's stated desire to be left alone (Incredible Hulk #102, 1968)
Lee Garbett: co-creator of Thor having a sister he didn't know of (Original Sin #5.1, 2014); of Loki's headband with horns (Loki: Agent of Asgard #1, 2014)
Keith Giffen: co-creator of Valkyrie wearing silver armor (Defenders #47, 1977)
Steven Grant: co-creator of the Grandmaster holding a "Contest of Champions" in which superhumans are pit against each other for the sake of his games; Thor and Hulk as contestants in the Grandmaster's game (Marvel Super-Hero Contest of Champions #1, 1982)
Mark Gruenwald: co-creator of the Grandmaster holding a "Contest of Champions" in which superhumans are pit against each other for the sake of his games; Thor and Hulk as contestants in the Grandmaster's game (Marvel Super-Hero Contest of Champions #1, 1982); of the name for the Kronans, an extraterrestrial race of rock-like creatures (Official Handbook of the Marvel Universe #5, 1983)
Don Heck: co-creator of the Black Widow as an Avenger (Avengers #111, 1973); of Tony Stark, a wealthy industrialist who became a hero (Tales of Suspense #39, 1963); of the Black Widow, alias Natasha Romanoff (Tales of Suspense #52, 1964)
Dan Jurgens: co-creator of Loki impersonating Odin to claim the throne of Asgard (Thor #16, 1999)
Gil Kane: co-creator of the Soul Gem, from which the Infinty Gems were derived (Marvel Premiere#1, 1970)
Jack Kirby: co-creator of the Avengers, a team of super heroes including Thor, Hulk & Tony Stark, Loki battling the Avengers (Avengers #1, 1963); of Hulk battling Thor (Avengers #3, 1964); of the Hulk, Bruce Banner, a physicist who transforms into a massive, brutish creature with superhuman strength; the Hulk describing others as "puny" (Incredible Hulk #1, 1962); of the Hulk having green skin (Incredible Hulk #2, 1962); of the Hulk traveling vast distances by leaping (Incredible Hulk #3, 1962); of Thor, Asgardian god of thunder whose hammer Mjolnir can control weather and has a worthiness enchantment which prevents others from lifting it; Thor's silver helmet, red cape and blue bodysuit; Thor encountering extraterrestrials made of stone (Journey into Mystery #83, 1962); of Jane Foster, Thor's mortal love interest (Journey into Mystery #84, 1962); of Loki, Thor's evil brother who possesses the power to cast illusions and wears green/yellow; Loki's horned helmet; Asgard, home of the Norse Gods which connects to Earth via the rainbow bridge Bifrost; Heimdall, guardian of Bifrost; Odin, father of Loki & Thor (Journey into Mystery #85, 1962); of Thor's ability to channel lightning through his body even when separated from Mjolnir (Journey into Mystery #93, 1963); of the Frost Giants, creatures from the Nine Worlds; of Surtur, the immense fire demon who an enemy to all of Asgard (Journey into Mystery #97, 1963); of Sif, female Asgardian warrior, love interest to Thor; of Hela, Asgardian goddess of death; Hela's green costume, cape and large black headdress (Journey into Mystery #102, 1964); of Asgardians piloting sky ships; of Skurge the Executioner, an Asgardian warrior who wields an axe, wears blue armour and opposes Thor; Skurge's black beard and tattoos (Journey into Mystery #103, 1964); of Laufey, Loki's father, a giant; of Odin adopting Loki as Thor's foster brother; of the Hulk's fans waving banners and signs in a Hulk vs. Thor contest (Journey into Mystery #112, 1965); of Thor and Loki being friends in their youth (Journey into Mystery #113, 1965); of the Fenris Wolf, an immense Asgardian wolf (Journey into Mystery #114, 1965); of Volstagg, a red-haired, overweight and jovial Asgardian warrior; Hogun, a mostly-silent grim-faced and dark-haired Asgardian; and Fandral, a blond-haired dashing, adventurous Asgardian clad in green (Journey into Mystery #119, 1965); of Loki seeking to rule Asgard; Asgard possessing advanced technology (Journey into Mystery #120, 1965); of Tony Stark, a wealthy industrialist who became a hero (Tales of Suspense #39, 1963); of the Black Widow, Natasha Romanoff (Tales of Suspense #52, 1964); of the Cosmic Cube, a massively powerful artifact (Tales of Suspense #79, 1966); of Earth referred to as Midgard by Asgardians (Thor #126, 1966); of the prophecies of Ragnarok in which Asgard will be destroyed (Thor #127, 1966); of Surtur being the one to finally destroy Asgard at Ragnarok (Thor #128, 1966); of Ares, god of war (Thor #129, 1966)
David Anthony Kraft: co-creator of Valkyrie wearing silver armor (Defenders #47, 1977)
Stan Lee: co-creator of the Black Widow's red hair (Amazing Spider-Man #86, 1970); of the Avengers, a team of super heroes including Thor, Hulk & Tony Stark, Loki battling the Avengers (Avengers #1, 1963); of Hulk battling Thor (Avengers #3, 1964); of the Hulk, Bruce Banner, a physicist who transforms into a massive, brutish creature with superhuman strength; the Hulk describing others as "puny" (Incredible Hulk #1, 1962); of the Hulk colored green (Incredible Hulk #2, 1962); of the Hulk traveling vast distances by leaping (Incredible Hulk #3, 1962); of Thor, Norse god of thunder, defender of Earth, wields hammer Mjolnir which can control storms, always returns to his hand and can only be lifted by those who are worthy of its power; Thor's silver helmet, blue costume, bare arms and red cape; Thor encountering extraterrestrials made of stone (Journey into Mystery #83, 1962); of Jane Foster, Thor's mortal love interest (Journey into Mystery #84, 1962); of Loki, Thor's evil brother who possesses the power to cast illusions and wears green/yellow; Loki's horned helmet; Asgard, home of the Norse Gods which connects to Earth via the rainbow bridge Bifrost; Heimdall, guardian of Bifrost; Odin, father of Loki & Thor (Journey into Mystery#85, 1962); of Frigga, queen of Asgard, mother to Thor & Loki; of the Valkyrie, an order of Asgardian warrior woman who ride flying horses (Journey into Mystery #92, 1963); of Thor's ability to channel lightning through his body even when separated from Mjolnir (Journey into Mystery #93, 1963); of Loki trying to usurp Odin's throne (Journey into Mystery #94, 1963); of the Frost Giants, creatures from the Nine Worlds; of Surtur, the immense fire demon who an enemy to all of Asgard (Journey into Mystery #97, 1963); of Sif, female Asgardian warrior, love interest to Thor; of Hela, Asgardian goddess of death; Hela's green costume, cape and large black headdress (Journey into Mystery #102, 1964); of Asgardians piloting sky ships; of Skurge the Executioner, an Asgardian warrior who wields an axe, wears blue armour and opposes Thor; Skurge's black beard and tattoos (Journey into Mystery #103, 1964); of Laufey, Loki's father, a giant; of Odin adopting Loki to be Thor's foster brother; of the Hulk's fans waving banners and signs in a Hulk vs. Thor contest (Journey into Mystery #112, 1965); of Thor and Loki being friends in their youth (Journey into Mystery #113, 1965); of the Fenris Wolf, an immense Asgardian wolf (Journey into Mystery #114, 1965); of Volstagg, a red-haired, overweight and jovial Asgardian warrior with a wife and several children; Hogun, a mostly-silent grim-faced and dark-haired Asgardian; and Fandral, a blond, green-clad, dashing, adventurous Asgardian (Journey into Mystery #119, 1965); of Loki seeking to rule Asgard; Asgard possessing advanced technology (Journey into Mystery #120, 1965); of Doctor Strange, a sorcerer based out of a sanctum in Greenwich Village who wages war against mystical forces of evil; Strange wearing a blue shirt and orange gloves; the Sanctum's window bearing a symbol with two curved lines pierced by a third line; of Doctor Strange's golden amulet (Strange Tales #110, 1963); of Doctor Strange wearing a magical cape (Strange Tales #114, 1963); of Doctor Strange opposing Loki (Strange Tales #123, 1964); of Doctor Strange's red Cloak of Levitation and round amulet (Strange Tales #127, 1964); of Tony Stark, a wealthy industrialist who became a hero (Tales of Suspense #39, 1963); of the Black Widow, Natasha Romanoff (Tales of Suspense #52, 1964); of the Cosmic Cube, a massively powerful artifact (Tales of Suspense #79, 1966); of Banner transforming into the Hulk during periods of high emotional stress; of the Hulk having a savage or childlike disposition (Tales to Astonish #60, 1964); of Earth referred to as Midgard by Asgardians (Thor #126, 1966); of the prophecies of Ragnarok in which Asgard will be destroyed (Thor #127, 1966); of Surtur being the one to finally destroy Asgard at Ragnarok (Thor #128, 1966); of Ares, god of war (Thor #129, 1966)
Larry Lieber: co-creator of Thor, Norse god of thunder, defender of Earth, wields hammer Mjolnir which can control storms, can only be lifted by those who are worthy and always returns to his hand; Thor's silver helmet, blue costume, bare arms and red cape; Thor encountering extraterrestrials made of stone (Journey into Mystery #83, 1962); of Jane Foster, Thor's mortal love interest (Journey into Mystery #84, 1962); of Loki, Thor's wicked brother who has the power to cast illusions; Loki's green & yellow clothing, horned helmet; of Asgard, the realm where Thor lives; Bifrost, the rainbow bridge which connects Asgard to other worlds; Odin, lord of Asgard, father of Thor and Loki; Heimdall, guardian of Bifrost (Journey into Mystery #85, 1962); of Tony Stark, a wealthy industrialist who became a hero (Tales of Suspense #39, 1963)
Ron Lim: co-creator of the Infinity Gems, six all-powerful stones wielded together as the Infinity Gauntlet (Thanos Quest #1, 1990)
William Messner-Loebs: co-creator of Odin being temporarily stranded on Earth in a mortal identity (Thor #497, 1996)
Bill Mantlo: co-creator of the Grandmaster holding a "Contest of Champions" in which superhumans are pit against each other for the sake of his games; Thor and Hulk as contestants in the Grandmaster's game (Marvel Super-Hero Contest of Champions #1, 1982)
Gray Morrow: co-creator of the Man-Thing, a monstrous character (Savage Tales #1, 1971)
Michael Avon Oeming: co-creator of Fandral and Hogun perishing in the events of Ragnarok (Thor #82, 2004); of Thor losing an eye during the events of Ragnarok (Thor #84, 2004); of Thor permitting Surtur to destroy Asgard so that he could vanquish a greater threat; of Volstagg perishing in Ragnarok (Thor #85, 2004)
Carlo Pagulayan: co-creator of Sakaar, an alien world which has a portal that has drawn various people from across the universe to the planet; the Hulk brought to Sakaar; Miek, an insectoid gladiator warrior on Sakaar; slaves on Sakaar controlled with discs pinned to their skin (Incredible Hulk #92, 2006); of Korg, a Kronan serve as a gladiator on Sakaar; Korg encountering Thor, Hulk and Miek (Incredible Hulk #93, 2006); of the Hulk donning full gladiator regalia including a feathered helm (Incredible Hulk #94, 2006); of Korg and Miek becoming revolutionaries; of the Hulk encountering an old ally from Earth in Sakaar's gladiator arena (Incredible Hulk #95, 2006)
Greg Pak: co-creator of Sakaar, an alien world which has a portal that has drawn various people from across the universe to the planet; the Hulk brought to Sakaar; Miek, an insectoid gladiator warrior on Sakaar; slaves on Sakaar controlled with discs pinned to their skin (Incredible Hulk #92, 2006); of Korg, a Kronan serve as a gladiator on Sakaar; Korg encountering Thor, Hulk and Miek (Incredible Hulk #93, 2006); of the Hulk donning full gladiator regalia including a feathered helm (Incredible Hulk #94, 2006); of Korg and Miek becoming revolutionaries; of the Hulk encountering an old ally from Earth in Sakaar's gladiator arena (Incredible Hulk #95, 2006)
Keith Pollard: co-creator of the planet Xandar (Fantastic Four #205, 1979)
Don Rico: co-creator of the Black Widow, Natasha Romanoff (Tales of Suspense #52, 1964)
John Romita: co-creator of the Black Widow's red hair (Amazing Spider-Man #86, 1970)
John Romita Jr.: co-creator of the Grandmaster holding a "Contest of Champions" in which superhumans are pit against each other for the sake of his games; Thor and Hulk as contestants in the Grandmaster's game (Marvel Super-Hero Contest of Champions #1, 1982); of Loki impersonating Odin to claim the throne of Asgard (Thor #16, 1999)
Luke Ross: co-creator of Odin being temporarily stranded on Earth in a mortal identity (Thor #497, 1996)
Marie Severin: co-creator of Hulk's stated desire to be left alone (Incredible Hulk #102, 1968)
Walter Simonson: creator of Beta Ray Bill, an extraterrestrial warrior whose skull is shaped like a horse (Thor #337, 1983); of the Eternal Flame, a mystical flame in Odin's custody; of Surtur needing to forge his sword in the Eternal Flame in order to destroy Asgard (Thor #349, 1984); of Odin dying before Loki and Thor's eyes (Thor #353, 1985); of Hela reclaiming her power without Odin to oppose her (Thor #354, 1985); of Thor forcing Loki to undo one of his spells by holding Loki by the neck while summoning Mjolnir to return to his hand (Thor #359, 1985); of Skurge the Executioner having a change of heart and giving his life to hold a bridge against Hela's army of the dead, dual-wielding two machine guns to destroy the dead soldiers, then wielding them as clubs when his ammunition runs out; of Skurge seen clubbing the dead from atop an immense pile of soldiers (Thor #362, 1985); of Loki's magic transforming Thor into a frog (Thor #363, 1986); of Thor wearing a beard (Thor #367, 1986)
Joe Sinnott: co-creator of Frigga, queen of Asgard, mother to Thor & Loki; of the Valkyrie, an order of Asgardian warrior woman who ride flying horses (Journey into Mystery #92, 1963); of Loki trying to usurp Odin's throne (Journey into Mystery #94, 1963)
Jim Starlin: co-creator of the Infinity Gems, six all-powerful stones wielded together as the Infinity Gauntlet (Thanos Quest #1, 1990)
Roy Thomas: co-creator of Ultron, the Avengers' enemy (Avengers #54, 1968); of Grandmaster, a cosmic being dressed in yellow clothes with pointed white hair and blue colouring; Grandmaster's obsession with games, often pitting superhuman people against each other (Avengers #69, 1969); of Doctor Strange's Sanctum being located at 177A Bleecker Street (Doctor Strange #182, 1969); of the Night-Crawler, an otherworldly creature (Incredible Hulk #126, 1970); of Valkyrie, an Asgardian warrior woman who encounters the Hulk (Incredible Hulk #142, 1971); of the Soul Gem, from which the Infinty Gems were derived (Marvel Premiere #1, 1970); of the Man-Thing, a monstrous character (Savage Tales #1, 1971); Odin having only one eye (Thor #274, 1978); of Gungnir, Odin's great spear (Thor #275, 1978); of Thor and Hulk joining forces to battle Hela (Thor #489, 1995)
Herb Trimpe: co-creator of the Night-Crawler, an otherworldly creature (Incredible Hulk #126, 1970); of Valkyrie, an Asgardian warrior woman who encounters the Hulk (Incredible Hulk #142, 1971); of the Bi-Beast, a two-headed creature (Incredible Hulk #169, 1973)
Len Wein: co-creator of Valkyrie's enchanted sword Dragonfang (Defenders #12, 1974)
Marv Wolfman: co-creator of the planet Xandar (Fantastic Four #205, 1979)
M. C. Wyman: co-creator of Thor and Hulk joining forces to battle Hela (Thor #489, 1995)