History ThrowItIn / AnimeAndManga

* ''Manga/JojosBizarreAdventureBattleTendency'': Remember the scene where Kars playing with [[spoiler:an unconscious Lisa Lisa's]] legs like a guitar in the anime? That wasn't in the original script. The original manga doesn't have the leg guitar gag on the panel that have this scene on. The dub takes this further by having Kars' dub voice actor, John [=DeMita=], to not only mimic an electric guitar, but also have him hum ''[[LeaningOnTheFourthWall the opening bars of "Roundabout"]]''.

* ''Anime/SmilePrettyCure'': InUniverse. The main cast volunteers to help a director shoot a JidaiGeki film in Episode 33, but there's always someone going OffTheRails in some way: Miyuki says "[[GratuitousEnglish Ultra]] [[CatchPhrase Happy]]!", Akane (playing a literal DemonicSpider) can't help but speak in her KansaiRegionalAccent, Nao is a HighlyVisibleNinja that pretty much has a soccer kick-off contest with Akane to keep Reika who's playing the DamselInDistress. Nao loses, but Pop joins in and challenges Akane to an [[NarmCharm amusingly dramatic]] samurai showdown in which he wins. The other actors are constantly worried [[LampshadeHanging that the script is not being followed at all]] while the director is getting more and more excited as the shot is being taken. See it in all its glory [[https://www.youtube.com/watch?v=vCYSDWDls9A here]].

* In ''LightNovel/{{Durarara}}'', the kitty ears on Celty's helmet was originally a joke by Narita, but it was kept because the character designer really liked it.

* In ''LightNovel/HighSchoolDxD'', it was revealed in the afterword of Volume 12 that Ophis wasn't supposed to join the Occult Research Club group, though the author and his editor liked her design so much that he made her join anyway.

* In the anime adaptation of ''LightNovel/KonoSuba'', the actors are frequently in the recording booth together and encouraged to ad-lib. In particular, much of Kazuma's interjections, including his famous "Hai, Kazuma desu!", are ad-libs by Creator/JunFukushima.

* Minor example in the UsefulNotes/LatinAmerica dub of ''Anime/DragonBallZ''. In this scene during the Cell Games arc: in the original Vegeta only growls in anger at Cell's remark. However, Creator/ReneGarcia let out [[https://www.youtube.com/watch?v=R7O8HPRdxlk "He didn't just steal my cells, also my dialogues!!]]" as a joke during the recording. The studio found it so funny, they left it in.

* In the English dub of ''Anime/Persona5TheAnimation'', Ryuji throws Morgana and says "yeet" when he does so. He didn't say this in the original Japanese dub. According to his English voice actor, he couldn't resist saying it and ab-libbed it.

* ''Manga/BocchiTheRock'': When her bandmates suggest that she open an "Isstagram" account, Bocchi [[https://youtu.be/z3IA5X2tfR0?t=37 responds]] by glitching out and screaming horrifically. The voice director's plan was to distort the screaming in post to sound like an audio corruption, but Yoshino Aoyama was able to get the intended effect entirely on her own, with this take being used in the final episode.

* The first of Creator/TakeshiShudo's [[LightNovel/PocketMonstersTheAnimation novelizations]] for ''Anime/PokemonTheSeries'' states that Team Rocket's line said every time they're defeated, 「やな感じ」 "ya na kanji," lit. "bad feeling," was ad-libbed by their Japanese voice actors.

* ''LightNovel/HaruhiSuzumiya'':
** During the "Day of Sagittarius" episode, each of the SOS-dan members was commanding a space fleet, and each of them was shown in a bridge filled with BridgeBunnies of their own imagining (ItMakesSenseInContext). Mikuru's crew (a bunch of stuffed animals) were lifted from doodles that Creator/AyaHirano (Haruhi's seiyuu and occasional {{Cloudcuckoolander}}) had drawn in the margin of her scripts.

* The heroines singing in ''Anime/{{Symphogear}}'' as they battle was completely by accident. The songs were originally meant just to be BGM, but Creator/MinamiTakiyama (Kanade’s VA) accidentally started singing along as they fought and the creators rolled with it.

* Another InUniverse example and played UpToEleven: ''Anime/SmilePrettyCure'''s main cast volunteers to help a director shoot a JidaiGeki film in Episode 33, but there's always someone going OffTheRails in some way: Miyuki says "[[GratuitousEnglish Ultra]] [[CatchPhrase Happy]]!", Akane (playing a literal DemonicSpider) can't help but speak in her KansaiRegionalAccent, Nao is a HighlyVisibleNinja that pretty much has a soccer kick-off contest with Akane to keep Reika who's playing the DamselInDistress. Nao loses, but Pop joins in and challenges Akane to an [[NarmCharm amusingly dramatic]] samurai showdown in which he wins. The other actors are constantly worried [[LampshadeHanging that the script is not being followed at all]] while the director is getting more and more excited as the shot is being taken. See it in all its glory [[https://www.youtube.com/watch?v=vCYSDWDls9A here]].

* Minor example in the UsefulNotes/LatinAmerica dub of ''Anime/DragonBallZ''. In this scene during the Cell Games arc: [[https://www.youtube.com/watch?v=YqegRtQB-jY]] in the original Vegeta only growls in anger at Cell's remark. However, Creator/ReneGarcia let out "He didn't just steal my cells, also my dialogues!!" as a joke during the recording. The studio found it so funny, they left it in.

* In ''Manga/DetectiveConan'', the character Wataru Takagi did not originally exist. He was a nameless character. In one scene, Inspector Megure asks his name and his voice actor (Creator/WataruTakagi) responded with his name. Gosho Aoyama, the mangaka, kept it in.

* The first of Creator/TakeshiShudo's [[LightNovel/PocketMonstersTheAnimation novelizations]] for the ''Anime/{{Pokemon}}'' anime states that Team Rocket's line said every time they're defeated, 「やな感じ」 "ya na kanji," lit. "bad feeling," was ad-libbed by their Japanese voice actors.

* In one episode of ''Anime/DragonBallSuper'', Goku is forced to completely sell a punch by Mr. Satan to get away from Chi-Chi, who caught him training instead of working. [[https://youtu.be/94YetXo7kWE In the English Dub]], as Goku goes flying and he grabs his tractor, Goku goes "Aaaaah, I forgot my tractor, ahhhh". According to Chris Sabat, it was actually an outtake that people thought made the scene funnier.

* Another InUniverse example and played UpToEleven: ''Anime/SmilePrettyCure'''s main cast volunteers to help a director shoot a JidaiGeki film in Episode 33, but there's always someone going OffTheRails in some way: Miyuki says "[[GratuitousEnglish Ultra]] [[CatchPhrase Happy]]!", Akane (playing a literal DemonicSpider) can't help but speak in her KansaiRegionalAccent, Nao is a HighlyVisibleNinja that pretty much has a soccer kick-off contest with Akane to keep Reika who's playing the DamselInDistress. Nao losses, but Pop joins in and challenges Akane to an [[NarmCharm amusingly dramatic]] samurai showdown in which he wins. The other actors are constantly worried [[LampshadeHanging that the script is not being followed at all]] while the director is getting more and more excited as the shot is being taken. See it in all its glory [[https://www.youtube.com/watch?v=vCYSDWDls9A here]].

** When Creator/NorioWakamoto was brought in to record the voice of Chiyo-chan's "father" in ''Manga/AzumangaDaioh'', all of his scenes had already been scripted and animated. While he kept to the scripted lines, his delivery invariably ran longer than the animation (in one case, ''over a full minute'' longer). Rather than rerecord his lines, they reanimated the scenes to match them.

* In ''{{LightNovel/Durarara}}'', the kitty ears on Celty's helmet was originally a joke by Narita, but it was kept because the character designer really liked it.
* The ''Manga/AxisPowersHetalia'' anime apparently has a lot of this too. France and England's seiyuus Creator/MasayaOnosaka and Creator/NoriakiSugiyama said in an interview that most of their characters' fights are ad-libbed.

* In ''{{Anime/Noir}}'', because her character Kirika is so laconic Creator/HoukoKuwashima was encouraged to do this, and wound up ad-libbing "there we go" at certain points where she found it appropriate.

* ''Anime/SuperDimensionFortressMacross''