The colorful cast of The Flash has gone through multiple changes in their personalities, most of them Depending on the Writer in the comics.
- Jay Garrick was initially shown as someone willing to kill his enemies, before mellowing into much more typically The Cape, albeit one with a playful personality. After a Time Skip when his comic was out of publication, he grew up, and nowadays Jay is almost exclusively written as Team Dad to others, who can be quite a hard-ass but is a Cool Old Guy and Papa Wolf at his core.
- Wally West, prior to graduating from Kid Flash to Flash, actually retired to focus on schoolwork, which is completely at odds with his later characterisation as having always been a huge Ascended Fanboy. Likewise, in his youth, he was eager to settle down with his girlfriend Frankie Kane, but after they broke up and he became the Flash, he became something of a skirt-chaser, and occasionally made chauvinistic remarks towards women. After a while, this completely disappeared and he was written with a Single-Target Sexuality for his primary love interest, Linda Park. Although this was in-part a reflection of Wally's larger Character Development and also just a reflection of how much he loved Linda, he's only depicted as having been a player in his youth rather than someone with misogynistic leanings (especially as he's depicted as being extremely close to his Aunt Iris and a very supportive friend to the women in his life).
- Jesse Quick, when first introduced, was a bubbly, upbeat self-described bookworm and ascended fangirl, who was a huge fan of both the JSA and the Flash. When she was transplanted from JSA to The Flash (and later, Titans), she was written as more of a studious and anxious tomboy, a Workaholic busy-body, and much more hotheaded. A lot of this can be justified though by the fact that early on she suffered a Broken Pedestal moment with Wallynote , and then shortly after her father died, saddling her with his company that she wasn't at all qualified to run, making her extremely busy the whole time. Later still, she became much more upbeat again when she returned to the JSA, due to falling in love with Rick Tyler.
- In a case that was not well-received, Bart Allen went from a character with severe Attention Deficit... Ooh, Shiny!, upbeat though hot-headed and quick to anger, and a total goofball who was pretty uninterested in anything serious, like relationships. Then he upgraded from Impulse to Kid Flash and suddenly lost the ADHD, became quite angsty, and developed a tendency to make pervy remarks. Then he got a Plot-Relevant Age-Up and became The Flash, which lead to even more angsty seriousness. Fans did not like this, so when he was killed off and came back, he was back to being an immature kid with ADHD.
- Wallace West, when initially introduced, just went by "Wally"note and was initially a delinquent and Angry Black Kid who hated the Flash. Then suddenly he became a happy teen genius, as the writing team didn't know what to do with him and his earlier characterisation was criticised for being offensively stereotypical. After DC Rebirth gave him his superhero origin, he was streamlined into a kid who just wanted love, a "Well Done, Son" Guy who thought his dad didn't love him and was desperate for a male parental figure to show him some damn support.
- The nature of Daniel West's relationship with Wallace West. While there's the obvious case of him being Wallace's uncle before the retcon that made him Wallace's father, there's also the nature of their relationship itself. Wallace's debut made it clear that Daniel gave absolutely no shits about Wallace and Wallace was in denial about Daniel's criminal life. Later on, however, it was decided that Daniel would be a positive influence on Wallace and he's shown to genuinely encourage his studying, while Wallace knew Daniel was a screw-up but always believed he'd turn his life around.
- August Heart/Godspeed, when first introduced was a Cowboy Cop turned Knight Templar Serial Killer and Evil Former Friend to Barry Allen. He wasn't particularly well-liked, so he got retooled into the Flash's Token Evil Teammate and Wild Card. Though this could just be Character Development, it happened largely off-screen so instead comes off as just changing plans for him.
