In short: a misstep that doesn't seem to understand the appeal of its protagonist or antagonist.
Jason Aaron (writer): co-creator of Zelma Stanton, a toque-wearing young woman who was affected by brain maggots (Doctor Strange #1, 2015); of Zelma Stanton learning how to practice magic (Doctor Strange #20, 2017)
Chris Bachalo (artist): co-creator of Zelma Stanton, a toque-wearing young woman who was affected by brain maggots (Doctor Strange #1, 2015); of Zelma Stanton learning how to practice magic (Doctor Strange #20, 2017)

Brian Michael Bendis (writer): co-creator of Riri Williams, a brilliant young engineer at MIT who studies Tony Stark's technology and develops her own suit of armor based on his, taking the armor out on test flights (Invincible Iron Man #7, 2016); of Riri entering MIT while still a young teenager (Invincible Iron Man #8, 2016); of Ronnie Williams, Riri's mother (Invincible Iron Man #12, 2016); of Natalie Washington, Riri Williams' best friend; of Riri's father and Natalie Washington dying when Riri was young when they were hit by stray bullets from a gunfight; of Riri deciding to honour Tony Stark's legacy by becoming a hero (Invincible Iron Man #1, 2017); of Riri completing her version of the Iron Man armor and going public as Ironheart (Invincible Iron Man #3, 2017); of Ronnie Williams learning Riri is an armored hero and choosing to support her (Invincible Iron Man #5, 2017); of Xavier, an old friend of Riri Williams and sometimes-romantic interest (Invincible Iron Man #595, 2017); of the Hood leading a personal army of superhuman criminals (New Avengers #33, 2007); of Rampage as a member of the Hood's gang (New Avengers #35, 2007); of the Hood's cloak being connected to Dormammu; of the Slug as a member of the Hood's army (New Avengers #46, 2008)
Robert Bernstein (writer): co-creator of Stark Industries, Tony Stark's company (Tales of Suspense #45, 1963)
Mark Bright (artist): co-creator of Obadiah Stane's death following a battle with Iron Man (Iron Man #200, 1985)
John Buscema (artist): co-creator of Mephisto, demon closely resembling Satan, seeks to corrupt and claim the souls of pure people (Silver Surfer #3, 1968)
Stefano Caselli (artist): co-creator of Natalie Washington, Riri Williams' best friend; of Riri's father and Natalie Washington dying when Riri was young when they were hit by stray bullets from a gunfight; of Riri deciding to honour Tony Stark's legacy by becoming a hero (Invincible Iron Man #1, 2017); of Riri completing her version of the Iron Man armor and going public as Ironheart (Invincible Iron Man #3, 2017); of Ronnie Williams learning Riri is an armored hero and choosing to support her (Invincible Iron Man #5, 2017); of Xavier, an old friend of Riri Williams and sometimes-romantic interest (Invincible Iron Man #595, 2017)
Joe Casey (writer): co-creator of the Clown as an assassin (Deathlok #3, 1999)
Chris Claremont (writer): co-creator of Madripoor, a nation with a great deal of organized crime (New Mutants #32, 1985)
Mike Deodato Jr. (artist): co-creator of Riri Williams, a brilliant young engineer at MIT who studies Tony Stark's technology and develops her own suit of armor based on his, taking the armor out on test flights (Invincible Iron Man #7, 2016); of Riri entering MIT while still a young teenager (Invincible Iron Man #8, 2016); of Ronnie Williams, Riri's mother (Invincible Iron Man #12, 2016)
Steve Ditko (artist): co-creator of Doctor Strange, a master of the mystic arts who champions Earth (Strange Tales #110, 1963); of Dormammu, a fiery demonic entity who opposes Dr. Strange (Strange Tales #115, 1963); of the Dark Dimension, a mystical realm (Strange Tales #126, 1964); of Kaecillius, a mystic foe of Dr. Strange (Strange Tales #130, 1965)
Bill Everett (artist): co-creator of Kamar-Taj, the temple where Doctor Strange studied sorcery (Strange Tales #148, 1966)
Eve L. Ewing (writer): co-creator of N.A.T.A.L.I.E., Neuro-Autonomous Technical Assistant & Laboratory Intelligence Entity, an artificial intelligence created by Riri Williams that was based on her deceased friend Natalie Washington and accidentally took form without Riri's direct supervision (Ironheart #1, 2019); of Ironheart visiting Wakanda and befriending Shuri (Ironheart #9, 2019)
Matt Fraction (writer): co-creator of Ezekiel Stane revealed to be Obadiah Stane's son (Invincible Iron Man #1, 2008); of Ezekiel Stane, criminal who has bionic technology throughout his body, enabling him electrical powers (The Order #8, 2008)
Mike Friedrich (writer): co-creator of Thanos, extraterrestrial despot (Iron Man #55, 1973)
Archie Goodwin (writer): co-creator of Howard Stark, deceased father of Tony Stark and previous owner of Stark Industries (Iron Man #28, 1970)
Mark Gruenwald (writer): co-creator of the Slug, a gangster (Captain America #324, 1986)
Don Heck (artist): co-creator of Rampage, alias Stuart Clarke, a technology-wielding criminal (Champions #5, 1976); of Howard Stark, deceased father of Tony Stark and previous owner of Stark Industries (Iron Man #28, 1970); of Iron Man, alias Tony Stark, a genius inventor who built his own armor and used his inventions for good (Tales of Suspense #39, 1963); of Stark Industries, Tony Stark's company (Tales of Suspense #45, 1963)
Kyle Hotz (artist): co-creator of the Hood, alias Parker Robbins, a small-time criminal who obtained a mystical cloak that granted him supernatural powers; the Hood wielding twin pistols; of John King, Parker's cousin and cohort in crime; of Parker's father Arthur Robbins (the Hood #1, 2002)
Reginald Hudlin (writer): co-creator of Shuri, Wakandan hero (Black Panther #2, 2005)
Tony Isabella (writer): co-creator of Rampage, alias Stuart Clarke, a technology-wielding criminal (Champions #5, 1976)
Jack Kirby (artist, writer): co-creator of Wakanda, the secretive high-tech African nation (Fantastic Four #52, 1966); of Vibranium, the rare metal found in Wakanda which powers most of their technology (Fantastic Four #53, 1966); of the Kree, an extraterrestrial race (Fantastic Four #64, 1967); of the Clown, a criminal (Incredible Hulk #3, 1962); of Thor, the hammer-wielding godly hero (Journey into Mystery #83, 1962); of Iron Man, alias Tony Stark, a genius inventor who built his own armor and used his inventions for good (Tales of Suspense #39, 1963); of Hank Pym, a brilliant scientist who discovered Pym Particles (Tales to Astonish #27, 1962)
Barry Kitson (artist): co-creator of Ezekiel Stane, criminal who has bionic technology throughout his body, enabling him electrical powers (The Order #8, 2008)
Salvador Larroca (artist): co-creator of Ezekiel Stane revealed to be Obadiah Stane's son (Invincible Iron Man #1, 2008)
Stan Lee (writer): co-creator of Wakanda, the secretive high-tech African nation (Fantastic Four #52, 1966); of Vibranium, the rare metal found in Wakanda which powers most of their technology (Fantastic Four #53, 1966); of the Kree, an extraterrestrial race (Fantastic Four #64, 1967); of the Clown, a criminal (Incredible Hulk #3, 1962); of Thor, the hammer-wielding godly hero (Journey into Mystery #83, 1962); of Mephisto, demon closely resembling Satan, seeks to corrupt and claim the souls of pure people (Silver Surfer #3, 1968); of Doctor Strange, a master of the mystic arts who champions Earth (Strange Tales #110, 1963); of Dormammu, a fiery demonic entity who opposes Dr. Strange (Strange Tales #115, 1963); of the Dark Dimension, a mystical realm (Strange Tales #126, 1964); of Kaecillius, a mystic foe of Dr. Strange (Strange Tales #130, 1965); of Iron Man, alias Tony Stark, a genius inventor who built his own armor and used his inventions for good (Tales of Suspense #39, 1963); of Stark Industries, Tony Stark's company (Tales of Suspense #45, 1963); of Hank Pym, a brilliant scientist who discovered Pym Particles (Tales to Astonish #27, 1962)
Kevin Libranda (artist): co-creator of Ironheart's armor in red, black and gold colours (Champions #22, 2018); of N.A.T.A.L.I.E., Neuro-Autonomous Technical Assistant and Laboratory Intelligence Entity, an artificial intelligence created by Riri Williams that was based on her deceased friend Natalie Washington and accidentally took form without Riri's direct supervision (Ironheart #1, 2019)
Larry Lieber (writer): co-creator of Thor, the hammer-wielding godly hero (Journey into Mystery #83, 1962); of Iron Man, alias Tony Stark, a genius inventor who built his own armor and used his inventions for good (Tales of Suspense #39, 1963); of Hank Pym, a brilliant scientist who discovered Pym Particles (Tales to Astonish #27, 1962)
Leonardo Manco (artist): co-creator of the Clown as an assassin (Deathlok #3, 1999)
Luke McDonnell (artist): co-creator of Obadiah Stane, a businessman who secretly sought to seize control of Stark Industries, pitting himself against Iron Man (Iron Man #166, 1983)
Paul Neary (artist): co-creator of the Slug, a gangster (Captain America #324, 1986)
Dennis O'Neil (writer): co-creator of Obadiah Stane, a businessman who secretly sought to seize control of Stark Industries, pitting himself against Iron Man (Iron Man #166, 1983); of Obadiah Stane's death following a battle with Iron Man (Iron Man #200, 1985); of Kamar-Taj, the temple where Doctor Strange studied sorcery (Strange Tales #148, 1966)
John Romita Jr. (artist): co-creator of Shuri, Wakandan hero (Black Panther #2, 2005)
Bill Sienkiewicz (artist): co-creator of Madripoor, a nation with a great deal of organized crime (New Mutants #32, 1985)
Paul Smith (artist): co-creator of Kaecillius' name (Doctor Strange #56, 1982)
Jim Starlin (artist, writer): co-creator of Thanos, extraterrestrial despot (Iron Man #55, 1973)
Roger Stern (writer): co-creator of Kaecillius' name (Doctor Strange #56, 1982)
Billy Tan (artist): co-creator of the Hood's cloak being connected to Dormammu; of the Slug as a member of the Hood's army (New Avengers #46, 2008)
Brian K. Vaughan (writer): co-creator of the Hood, alias Parker Robbins, a small-time criminal who obtained a mystical cloak that granted him supernatural powers; the Hood wielding twin pistols; of John King, Parker's cousin and cohort in crime; of Parker's father Arthur Robbins (the Hood #1, 2002)
Luciano Vecchio (artist): co-creator of N.A.T.A.L.I.E., Neuro-Autonomous Technical Assistant and Laboratory Intelligence Entity, an artificial intelligence created by Riri Williams that was based on her deceased friend Natalie Washington and accidentally took form without Riri's direct supervision (Ironheart #1, 2019); of Ironheart visiting Wakanda and befriending Shuri (Ironheart #9, 2019)
Leinil Francis Yu (artist): co-creator of the Hood leading a personal army of superhuman criminals (New Avengers #33, 2007); of Rampage as a member of the Hood's gang (New Avengers #35, 2007)
Jim Zub (writer): co-creator of Ironheart's armor in red, black and gold colours (Champions #22, 2018)