X Meets Y/Fan Works

Fan Fics

 * Pretty Cure Heavy Metal is Pretty Cure meets K-On! and Guns N' Roses.
 * Pretty Cure Hollywood Stars is Pretty Cure meets Eiga Sentai Scanranger with a heaping of Darker and Edgier.
 * Pretty Cure Dimensional Evolution is Pretty Cure meets Watchmen and Megamind.
 * Pretty Cure Strange Happenings is Pretty Cure meets Kore Zom and Inspector Gadget.
 * Pretty Cure: Agents of Romero is Pretty Cure meets Highschool of the Dead.
 * Pretty Cure Contemporary Mouseworks is Pretty Cure meets modern-day Disney.
 * Pretty Cure Transient School is Pretty Cure meets trap fiction taken Up to Eleven (in quantity of traps, that is).
 * Tokyo Mew Mew No Hope Left: Tokyo Mew Mew meets My Immortal.
 * Pretty much the whole 'crossover' genera of fanfics is this trope played (generally) straight.
 * Although not a crossover, the author of "Evangelion: The Rite of Spring" has described the story as "Neon Genesis Evangelion meets Puella Magi Madoka Magica... in an art school."
 * The Wolf Blood Lineage is My Immortal meets Metalocalypse.
 * Hogwarts Exposed is Harry Potter meets FATAL.
 * Candy for Your Thoughts: Disney's Total Drama World Tour.
 * The Son of the Emperor is My Little Pony meets the Napoleonic Wars
 * Our First Steps is The Right Stuff meets My Little Pony
 * Cupcakes is My Little Pony Friendship Is Magic meets Higurashi no Naku Koro ni.
 * Kyon: Big Damn Hero is Haruhi Suzumiya meets TV Tropes.
 * Heta Oni is pretty much Hetalia meets Higurashi No Naku Koro Ni
 * Point of Succession is Death Note meets Dexter and Criminal Minds
 * The Prince of Death is Death Note meets Hellsing
 * A Cure for Love is Death Note meets Torchwood meets The Smiths meets Brazil.
 * The Faceless is Death Note meets All Quiet on the Western Front meets Mirror Mask.
 * Ace Combat: The Equestrian War is My Little Pony Friendship Is Magic meets Ace Combat.
 * Ragnarok (fanfic) is Death Note meets CSI and Criminal Minds.
 * Constant Temptation is Death Note meets Angel meets X-Men meets Saw.
 * For Good is Buzz Lightyear of Star Command meets Star Trek meets Star Wars Expanded Universe meets Ghost in the Shell: Stand Alone Complex.
 * Q-Basic Gorillas is Transformers meets Rise of the Planet of the Apes - By design!

Characters

 * Pretty Cure Heavy Metal:
 * Sakura Cobain is Nozomi Yumehara meets W. Axl Rose minus the big ego.
 * Shugo Kino is Haruhi Suzumiya meets Akira Tanemura, Akane Mishima, and Utena, later mixed with Harvey Two-Face.
 * Pretty Cure Hollywood Stars:
 * Alex Hollis is Natsuru Seno meets Princess Tutu.
 * Lina Eastwood is Lina Inverse meets The Man With No Name, Akane Mishima, and Misty Waterflower.
 * Pretty Cure Dimensional Evolution:
 * Mikoto Hanazawa is Ayame Yami meets Rorschach and Naoto Shirogane.
 * Pretty Cure Strange Happenings:
 * Haru Nagato is Princess Tutu meets Hanae Mitsukawa, only with his own gender being different.
 * Sera Himekawa is Inspector Gadget meets Shana, Seraphim, and Shugo Kino.
 * Hana Tomonori is Pike meets Nagisa Misumi and Haruhi Fujioka.
 * Pretty Cure: Agents of Romero:
 * Daisuke Mikami is Takashi Komuro meets Ayumu Aikawa.
 * Rica Asakura is Naoto Shirogane meets Misty Waterflower.
 * Kasumi Avalon is Alice Maresato meets the casual equivalent of a British ballet student.
 * Pretty Cure Contemporary Mouseworks:
 * Tohru Nakamura is Suke Banji meets Ariel and Ben Marshall.
 * Haruhi Matsumoto is Haruhi Fujioka meets Andie and Inspector Gadget.
 * Pretty Cure Transient School:
 * Ashley Cavanaugh is Ben Marshall meets Haruhi Fujioka Gender Flipped and Amu Hinamori.
 * Lillian Newell is Haruhi Fujioka meets Sam and Naoto Shirogane.
 * Shiro Ishikawa is Hideyoshi Kinoshita meets Princess Tutu.
 * Fumi Misaki is Mio Akiyama meets Chachamaru Karakuri.
 * Hiro Kazuhara is Nadeshiko Fujisaki meets Ayumu Aikawa.
 * Takashi Kawasaki is the Hitachiin twins meet Ayameko Mayonaka and Ranma Saotome.
 * Sasami Minami is Shana meets Misty Waterflower and Utena Tenjou.
 * Jiro Ichinose is Bridget meets Kanade Tachibana.
 * In Harry Potter and The Methods of Rationality, Harry himself is basically Ender Wiggin meets Doctor Insano.
 * The Last Spartan places The Master Chief in Commander Shepard's role.
 * Cadet Ricki Sunflare is Samantha Carter meets Spock meets Dr. Watson.
 * Zomega is Major Kusanagi meets Talon Karrde meets Mara Jade Skywalker.
 * Q-Basic Gorillas: Col. Flix is Gil Grissom meets Optimus Prime.
 * Lord Quirini is Mr. Freeze meets Prince John meets a typical Bond villain.