The Magical Girl genre is one of the staple genres of anime and manga. It has existed in one form or another since almost the beginning of modern day animenote and has continued to be popular throughout the decades. It's gotten to the point where many non-Japanese works, such as W.I.T.C.H. and Winx Club, are based on Magical Girls.
As a result of the success of the genre, spinoff works or skits aren't rare where characters are turned into magical girls. Even if they're boys, they turn into magical girls.note Maybe it's All Just a Dream, maybe it's an outright Alternate Universe, but for whatever reason the characters in a work are suddenly transformed into magical girls.
Most of these AUs are very tongue-in-cheek or are outright magical girl parodies. Magical Girl tropes are usually exaggerated as a result. The protagonist will become a Pink Heroine in Frills of Justice who screams out her attacks and fights against a Monster of the Week. Though most magical girl AUs are light and comedic, some works do take it seriously. Many take inspiration from either Sailor Moon or Pretty Cure, though more obscure references and nondescript pastiches of magical works are also commonplace.
If this AU appears in non-Japanese works, expect it to be a parody (often a Shallow Parody) of Sailor Moon; hence the Sailor Senshi Send-Up trope. Though numerous magical girl anime have been dubbed outside of Japan, the only one to strike out of the Girl-Show Ghetto and become mainstream was the 1990s Sailor Moon anime. As a result, any magical girl anime tends to be called a "Sailor Moon ripoff" by non-magical girl fans and especially non-anime fans.
- Sayonara, Zetsubou-Sensei had a bit where characters turned into Lily Cure and Itoshiki was the Big Bad.
- There is a Nisekoi Magical Girl spinoff called Magical Patissier Kosaki-chan, written and illustrated by Tsutsui Taishi, the author behind We Never Learn. It stars Kosaki, Chitoge, and Marika as magical girls.
- Lyrical Nanoha is the once-removed More Popular Spin-Off of an adult visual novel called Triangle Heart 3: Sweet Songs Forever:
- In the original VN, Nanoha appeared as a minor character, being the Adorably Precocious Child little sister of protagonist Kyouya Takamachi. The accompanying fandisc Lyrical Toybox would give her A Day in the Limelight, making her the star of a short Parody scenario called "Magical Girl Lyrical Nanoha" where she received Magical Girl powers from a fairy called Lindy in order to fight a boy named Chrono.
- This story would later be adapted into the anime Magical Girl Lyrical Nanoha, which changed many things heavily (including Nanoha's original Magical Girl outfit becoming her school uniform, and Lindy and Chrono becoming human members of the Time-Space Administration Bureau who assist her). Most characters from Triangle Heart are reduced to Mythology Gag cameos with no supernatural elements and fade into the background quickly, while the role of Kuon is split into a pair of new characters, Yuuno and Arf. Partway through development, it was noted that Nanoha's sleeves looked like something out of Gundam, and thus was born a Magitek Magical Girl Warrior series with gratuitous references to automobiles and Super Robot Wars. Weirdly, the story actually drops back out of the Magical Girl genre as time goes on, with the third season having Nanoha grow up and command a unit of military wizards in another dimension.
- Black Lagoon had an OVA Alternate Universe that turned Revy into a magical girl called "Radical Girl Revy-Chan". She solves all her problems with guns before returning to the magical land of Hestonworld. This gets Rock arrested.
- One of the Higurashi: When They Cry OVAs had Rika transform into a magical girl. The OVA is noticeably Lighter and Softer, Denser and Wackier, and more fanservicey than the normally dark and bloody series.
- Pretty Sammy and Sasami: Magical Girls Club are both magical-girl-based spinoffs of Tenchi Muyo! focusing on Sasami.
- Fate/kaleid liner PRISMA☆ILLYA is a spinoff of Fate/stay night that turns Illyasviel von Einzbern into a magical girl that uses card-based transformations to gain the powers of Heroic Spirits. Fate/stay night had a fourth route for Illya that was scrapped in development, with its remaining elements being folded into Part 3. While Prisma Illya is an Alternate Universe story and often silly, it gradually introduces elements that directly continue on from the themes at the end of the original story, and Kinoko Nasu has even said in interviews that it is the Illya route.
- In Powerpuff Girls Z, the titular girls from The Powerpuff Girls (1998) are given counterparts who are Magical Girls. It's a variant as the Z Powerpuff Girls aren't exactly the same characters, but able to transform into a form resembling the original Powerpuff Girls. The original Powerpuff Girls was a magical girl (and superhero) parody but the anime version plays the genre straight.
- Symphogear has the in-universe magical girl series Kaiketsu*Utazukin! (a parody of Akazukin Chacha) created to cover up the heroes' activities, with its protagonist implied to be based on Chris. While Symphogear itself only skirts the edges of Magical Girl Warrior (the protagonists being teenage and early-20s government agents in Powered Armor), Utazukin is presented as an old-school Cute Witch story, albeit one with a bizarre plot.
- Parodied in My Monster Secret. Akane created the Show Within a Show The Middle Aged Magical Girl, Magical Akalyn, basing it on Old Maid Akari's inability to get any guys. Akari isn't really pleased when she found out.
- Super Doll★Licca-chan is for all essences a Magical Girl Animated Adaptation of the Licca-chan toy line. In it, Licca is actually royalty. She uses three magical dolls to thwart the main villain.
- Cutie Honey Flash is essentially the Magical Girl AU for Cutey Honey, with Honey becoming a human girl with a Transformation Trinket collar rather than a high-tech android with form-changing nanomachines.
- Sonic the Hedgehog (Archie Comics) has an alternate universe called the Luna Zone where Sally and Amy's counterparts dress like Sailor Scouts and there's a version of Knuckles who dresses like Tuxedo Mask. There's also mention of a version of Eggman who acts like Queen Beryl.
- Wonder Woman and the Star Riders was a short-lived comic that had Wonder Woman in a team of Magical Girl Warriors.
- There was a Gen¹³ miniseries called Magical Drama Queen Roxy which had Freefall as a parody of magical girls. It turned out to be All Just a Dream.
- Dolphin Rider Koishi is a High School AU Touhou Project Fanfic starring a human version of Koishi Komeiji as a magical girl who rides a dolphin approximately once. Notable for not being a Parody or Darker and Edgier but played completely straight, being an idealistic story about Koishi helping the Woobie of the Week to get over deep-seated psychological issues.
- Friendship Is Magical Girls is a High School AU of My Little Pony: Friendship Is Magic featuring human versions of the characters living in a fictional stand-in of Japan, with the Mane Six being chosen as Magical Girl heroines.
- Lux-Umbra Magna Auguratricis serves as one of this for The Loud House. In it, the Loud sisters are turned into magical girl warriors in order to combat evil creatures simply known as Shadows.
- B K Willis's Sailor Who is a Meta Fic with Doctor Who companions (Susan, Leela, Zoe and Nyssa) plus the author's genderswapped avatar trying, and failing, to keep in character as Sailor Scouts.
- The Simpsons:
- Falling Is Like Flying, based on both A3 and Puella Magi Madoka Magica, is a Magical Boy AU. The incubators seem to only focus on male characters in this universe. And although Izumi also has powers, her situation is...strange.
- My Hero Academia:
- Quirk: Magical Girl Mascot, where Izuku's quirk can turn him and others into a Magical Girl Warrior. So far the magical girls include: Katsuki, Inko, Ochaco, Tsuyu, Shoto, Tenya, Toru, Melissa and All Might.
- Magical Hero Academia, though in a very loose sense of the trope. Rather than everybody being a magical girl, Midoriya can "preet" with people to become something like a magical girl, amplifying their powers in the process.
- I Can't Be a Magical Girl!! You, a Magical Girl, Say: Instead of being saved from the Sludge Villain by All Might, Izuku is saved by a Mentor Mascot called Handyman—and through the contract formed when Handyman saves his life, Izuku becomes a Magical Girl Warrior and learns to fight mysterious creatures nicknamed Gray Men, who have started invading Japan.
- Maple Sugar Pretty Cure is a Turning Red fic based on Futari wa Pretty Cure involving Mei and her friend group becoming the first generation of Pretty Cure.
- The Star Guardian skins of League of Legends. It first started with Lux and was treated as just a parody of Sailor Moon. It wasn't until skins of Jinx, Poppy, Janna, and Lulu came out that a backstory was established for the group.
- Heroes of the Storm gives Li-Ming a skin inspired by Sailor Moon, "Star Princess Li-Ming". There's also a spray that depicts Chromie as a Cute Witch-style magical girl.
- Honkai Impact 3rd: Theresa (as one of her "Valkyrie Suits", Sakuno Rondo) has a magical girl-inspired alternate costume, as well as a special rare weapon that goes with it, designed like a Magic Staff (but is still used like the mechanical crosses she usually uses). The Flavor Text for said weapon is a Shout-Out to Fate/kaleid liner PRISMA☆ILLYA, too.
- THE iDOLM@STER: SideM has the magical boy show Miracle Magic: Nozomira Melody, though it's less of a Warrior show and more of a Cute Wizard type. While it is an in-universe anime, the boys are shown to be Ink-Suit Actors for the main cast and are treated as such. Kanon, Shiro, and Nao are the magical boys, while Jirou, Rui, and Michio serve as their Mentor Mascots. A sequel "series" launched two years later, with all of Cafe Parade taking the main roles instead.
- Kiwi Blitz: A piece of official bonus artwork depicts the two main characters Steffi and Benzene as the magical girls Pop Blitz and Rock Blitz. Funnily enough, the author would later end up working on the magical girl series Sleepless Domain, and she took the opportunity to sneak in a Crossover Cameo appearance from Pop Blitz and her friends.
- Many of the alternate universes in General Protection Fault play Genre Roulette so, inevitably, there's one where Ki, Patty, Trish and Sharon are the Ultra Cyber Power Warriors GPF!, a team of internet-themed Magical Girl Warriors. Since the other three are the main versions taking on their counterparts' roles, Ki is the only one where we get the full transformation sequence. And Nick joins them dressed as the Linux penguin. Yes, he's Tux in a Mask.