Whenever the original instance of a character in a series gets obscured by later developments of the same character, whether it be a sequel, an adaptation, the casting of a breakout character, even a Retool of the original. In the most extreme cases the original installment hardly gets recognized by anyone but the most hardcore fans.
- The Yu-Gi-Oh! manga started out as the tale of a teenager whose dark side brings judgment on abusive people with lots of horrific implications. Halfway into the series the card game took over and everything from that point onwards became the tale of people beating each other in a Serious Business card game, with said horriffic implications appearing frpm time to time.
- Dragon Ball: Goku originally started out as a wild monkey boy from the distant mountains with inexplicable endurance and martial arts talent compared to normal people. Nowadays he's more famous for being descended from alien heritage and defeating ever-more fantastic villains with ki blasts.
- Anyone remember when Bulma was one of two main characters in the story?
- Thanks to the breakout success of Fate/kaleid liner PRISMA☆ILLYA, Illyasviel von Einzbern is best remembered as the cheery young girl with magical powers straight from a completely different genre than the big sister-like stunted adult grail vessel she was in Fate/stay night. Lampshaded by her stay night self's appearance in Fate/Grand Order, where upon meeting her as Sitonai, the Protagonist remarks that this is not the Illya they've grown accustomed to.
- Captain America is almost synonymous with The Avengers, despite the fact he predates them by twenty-two years and wasn't a part of the team's original roster.
- Wolverine's origins as a Hulk villain are hardly ever mentioned anymore, if at all.
- The villainous origins of the Scarlet Witch, and Hawkeye have pretty much been swept under the rug. Likewise, Quicksilver started as a straight villain, and now he is best known for his HeelFace Revolving Door tendencies.
- Mary Jane Watson is regarded as Spider-Man's true love, despite her original role as The Veronica.
- Justified, as the Betty has been dead for 40 years.... at least until a still-kicking alternate universe counterpart gained a lot of popularity.
- Originally, Tintin did some reporting, but by the fourth or fifth book, he seemed to have surreptitiously retired to the quiet life of getting swept up in fantastic adventures and foiling the plots of mustachioed movie moguls.
- H. P. Lovecraft's famous Mad Scientist Doctor Herbert West was described in the original pulp serial, Herbert WestReanimator, as blonde-haired and blue-eyed. Ever since the film adaptation of Re-Animator came out, however, just about every subsequent depiction of West in any other work made his appearance much closer to that of actor Jeffrey Combs.
- Saved by the Bell. Nobody remembers Miss Bliss, and nobody cares either.
- Similarly, few people remember that once upon a time, The Facts of Life featured girls named Molly, Nancy, Sue Ann, Laura, and Jennifer in addition to Tootie, Jo, Blair, and Natalie.
- The Fonz from Happy Days was originally conceived as an intimidating, occasionally violent tough-guy semi-villain and semi-criminal. Cue the Flanderization.
- Singer Julio Iglesias became a musician after a car crash. Before the accident he was Goalkeeper for the Real Madrid Youth Team.
- Ringo Starr is well known as The Beatles' drummer. Not many people remember his early fame as Rory Storm and the Hurricanes' Drummer.
- The Beatles' (also known as "The Fab Four ") early incarnation as a Five-Man Band.
- U.S. Acres. On the strips Orson started as a small piglet and grew up with the time learning important lessons along the way. On the animated shorts Orson is a mature Pig and the wisest character, often teaching important lessons to young chicks Booker and Sheldon.