A later writer introduced Emma Steed of the London Hellfire Club, who was even more Diana Rigg (Emma Peel's partner was John Steed).
The Diana Rigg and Peter Wyngarde parallels specifically were part of a Whole-Plot Reference to the Avengers episode "A Touch of Brimstone", also set at a Hellfire Club, and which had Mrs. Peel in the Jean Grey role and Peter Wyngarde as John Cleverly Carter in the Mastermind role.
Nightcrawler started to gradually look more and more like Errol Flynn, with his holographic image inducer calibrated specifically to look like him. Nightcrawler is also a huge Flynn fanboy, so in his case it was a cultivated look.
The disco-themed mutant Dazzler was modeled after Bo Derek, who was supposed to play the character in a live-action movie.
Later, when handling art honors for Excalibur, Alan Davis once stated that he modeled his Kitty Pryde after a young Katharine Hepburn.
UltimateNick Fury was drawn to look like Samuel L. Jackson. In the Marvel Cinematic Universe, Jackson was naturally cast in the role. This was an explicit arrangement; Jackson, a big comic book fan, gave Marvel free rein to use his likeness for the character as long as he could have the part in the movies (though only after he threatened to sue them for using his likeness without his knowledge or consent).
NYPD Detective Paul Budiansky, a one-arc character from The Punisher MAX is also modeled after Sam Jackson.
Shapeshifting Chitauri villain Herr Kleiser greatly resembles Robert Carlyle.
Gregory Stark looks very similar to James Bond star Daniel Craig, albeit with a mustache.
The Punisher MAX series has a lot of characters looking like famous "cool" actors in real life.
Frank himself is a beefy Clint Eastwood in the first arc; this is particularly evident when he's held prisoner by Microchip. Another artist basically turns him into the T-800.
According to Garth Ennis' script for issue #37 (which has since been taken down from its original spot in the Comic Book Script Archive by Marvel) Nicky Cavella's physical appearance was based on Andy García, and John James Toomey was based on Puff Daddy.
Darla Deering/Miss Thing from FF was modeled after pop star Katy Perry.
Detective Oscar Clemons from Greg Rucka's The Punisher run is based on Morgan Freeman. When he appeared in the first season of Jessica Jones, he was played by Clarke Peters instead, who is close enough in resemblance.
Clive Reston from the Shang-Chi comics was drawn to look like Roger Moore by the artist Paul Gulacy, specifically as he appeared during his time as James Bond. In the same series, Paul Gulacy turned Shang-Chi into a Bruce Lee Clone.
Circuit Breaker from The Transformers was modeled after Marvel colorist Janet "Jay Jay" Jackson.
John Romita admitted that he modeled Mary Jane Watson on Ann-Margret (specifically the way she looked in Bye Bye Birdie). More recently, Mike Deodato has drawn her as a red-haired Liv Tyler, and Paolo Rivera's take on her is a blend between Leighton Meester and Miranda Kerr, inspired by her dimples.
When she first appeared in Secret War, Daisy Johnson/Quake was drawn to look exactly like Angelina Jolie as she appeared in Hackers. As time went on, the resemblance lessened.
Don Heck based Pepper Potts off of actress Ann B. Davis, known at the time for her role on The Bob Cummings Show. She's best remembered today for playing Alice in The Brady Bunch.
Before the movies, Charles Xavier's bald head and thin eyebrows were reminiscent of Yul Brynner's distinct appearance. In several X-Men books since the movies, though, Professor Xavier has noticeably been drawn more like Patrick Stewart.
When Walt Simonson was the writer/artist on Thor, he based Lady Sif's look on actress Sigourney Weaver and The Enchantress' sister Lorelei on Debbie Harry of the punk band Blondie. This was Lampshaded in an issue◊ where a street punk tried to hit on Lorelei by asking if anyone had ever told her that she looks like "Blondie" before.
In cameos, the President of the United States has the face of Hillary Clinton and the TV newscaster is Letizia Ortiz, Spanish former TV newscaster who married Prince Felipe de Borbón.
On at least one occasion (the moment when Spider-Man revealed his secret identity), Peter Parker and J. Jonah Jameson look very much like Tobey Maguire and J. K. Simmons, respectively.
Steve Ditko's art can make it difficult to say for certain, but his early appearances sometimes more closely resemble Charlie Chan actor Warner Oland.
Morgana Blessing was based on singer Amy Grant, something her management team did not appreciate. They were worried that Grant being associated with a sorcerer like Doctor Strange would harm her standing in the Christian music community, and took legal action against Marvel. The case ultimately ended with an out-of-court settlement.
Ross' fully-painted artwork uses photo references for most major characters. Books like Kingdom Come and Marvels actually have model credits, mostly comprised of the artist's friends and fellow comic creators. And Richard Nixon as Norman Osborn.
Jack Kirby's pre-cosmic ray Ben Grimm borrows the look of Film Noir actor John Garfield.
In the second volume of Secret Avengers, Senator Robert Ralston, former Howling Commando and United Nations official overseeing SHIELD, is drawn to resemble a middle-aged Robert Redford.
◊ where a street punk tried to hit on Lorelei by asking if anyone had ever told her that she looks like "Blondie" before.
