History WhatHappenedToTheMouse / AnimeAndManga

* ''Anime/WeddingPeach'': Jama demon Blackie disappears partway through Volume 6 after serving to distract the Love Angels. The author [[LampshadeHanging notes this]] and comments that he's probably living peacefully in the redeemed demon world.

** And there's the infamous case of Launch. Launch was a prominent character in the original ''Dragon Ball'' saga, living with Master Roshi and having a crush of Tien. However, partway through the Saiyan Saga, when she disappears to look for help in dealing with the incoming threat of Vegeta and Nappa, she ends up not returning at all. Nothing is said about her whereabouts or what she was doing afterwards and only shows up ''once'' during the very end of the Buu Saga (and that's only in the anime because Akira Toriyama completely forgot about her and forgot how she looked). Although [[WordOfGod according to a 2013 interview with Toriyama]], she apparently moved in with Tien.

** At the end of the series, [[spoiler:we never learn what happened to Misa following Light's defeat]], but ''WordOfGod'' confirmed that [[spoiler:she committed suicide after finding out about his death. The anime hints at this by having a shot of her looking very blank-faced stood on top of a building. We don't see her jump... but the imagery alone is pretty depressing]].

* In ''Anime/GordianWarrior'', recurring {{Mook Lieutenant}}s Saimadok and Nenmadok vanish following a major battle between the heroes' and villains' forces in episode 66. The episode's [[AllThereInTheScript script]] contains death scenes for both of them, but they never made it into the final cut.

** The ''Anime/{{Macross}}'' series itself has a big one in the form of the ''Megaroad-01'' Fleet, which was carrying the protagonists from the original ''Anime/SuperDimensionFortressMacross''. According to the series chronology, the fleet simply ''vanished'' four years after its launch, somewhere near the center of the galaxy. Nobody, in-universe or out, knows what happened to them. [[spoiler:The manual for the video game ''Macross M3'' claims that the fleet got swallowed by a black hole, but fans are divided as to whether or not to take this as canon.]]

* In ''Anime/MobileSuitGundamSEEDDestiny'', Lord Djibril is seen in most of his appearances with a black Persian RightHandCat. However, when he escapes Heaven's Base, the cat disappears and is never seen again. The HD Remaster fixes this by showing the cat with Djibril in his escape and is last seen in Orb, looking up at the moon as its master escapes capture again.

*** Likewise, when the trainers are leaving the harbor to New Island, a trainer with a Fearow leaves as well...to never been seen again. She most likely didn't make it to the island. The worst: she doesn't reappear in the ending at all! It gets [[LampshadeHanging lampshaded]] in the [[Anime/MewtwoStrikesBackEvolution remake]], where Ash and Misty directly mention the trainer who didn't make it to the island,

** Averted with the Meteonite in the ''Black and White'' series, as the two-parter featuring it in full use was pulled from the air indefinitely and not looking to be broadcast any time soon, but a trailer for said episodes outright ''shows'' Pikachu destroying the Meteonite at the end, so what happened to it ''is'' actually known. Played straight with the Venipede who overran Castelia City due to the Meteonite being activated, though, as we have no clear explanation as to where they went later.

* ''Anime/MagicalWarfare'' has this bad, due to its tendency to introduce new story elements and plot twists at will and then forget about them almost immediately. We never find out what happened to Ida's sister, who was kidnapped by Wizard Brace's secret service. We never find out what happened to Takeshi's mother, who was training him using a ring that amplified her powers at the cost of her own life force. In fact, the show's [[NoEnding sudden and]] [[GainaxEnding incomprehensible ending]] means that hardly ''anyone'' gets any closure, not even ''the main character''.

* ''LightNovel/MagicalWarfare'' has this bad, due to its tendency to introduce new story elements and plot twists at will and then forget about them almost immediately. We never find out what happened to Ida's sister, who was kidnapped by Wizard Brace's secret service. We never find out what happened to Takeshi's mother, who was training him using a ring that amplified her powers at the cost of her own life force. In fact, the show's [[NoEnding sudden and]] [[GainaxEnding incomprehensible ending]] means that hardly ''anyone'' gets any closure, not even ''the main character''.

* ''LightNovel/{{Baccano}}'' manages to play with this. At one moment, one of the immortals is seen perfecting the Grand Panacea by crushing a mouse. When it is resurrected, he knows he has perfected the Cure-All Elixir. Soon, a fire consumes his workshop, allowing the mouse to escape. The final episode implies that even the mouse was a main character and continues to live to this day.

* ''LightNovel/FullMetalPanic'' has Sarah Miller (Known as Kudan Mira in the original Japanese version.) People who have watched the entire series may be wondering, who the hell is Sarah Miller? Well, she's the red haired girl who is rescued by Sousuke in [[ActionPrologue the very first episode]]. Her kidnapping by Gauron (along with her unique hair color) implies that she is a whispered and therefore fairly important, but she is never seen again or even mentioned outside of that opening scene. [[spoiler: In the anime at least. In the novels she comes up again, where it is revealed that she is indeed a whispered (and under the protection of Mithril.)]]

** The finale never really goes into detail explaining what happened to the tailed beasts after the war ended. [[spoiler:The Chibaku Tensei prisons are broken, but nothing more is shown.]] From ''The Last'', we know that [[spoiler:Kurama happily and willingly returned to being sealed inside Naruto]] and the Epilogue reveals that [[spoiler:Bee reunited with Gyuki.]] Also, ''LightNovel/GaaraHidenASandstormMirage'' reveals that Shukaku and Gaara remain together. Creator/MasashiKishimoto himself was vague when asked on the matter, saying, "I would hope they're living happily ever after...they're leading comfortable lives."

** And there's the infamous case of Launch. Launch was a prominent character in the original ''Dragon Ball'' saga, living with Master Roshi and having a crush of Tien. However, partway through the Saiyan Saga, when she disappears to look for help in dealing with the incoming threat of Vegeta and Nappa, she ends up not returning at all. Nothing is said about her whereabouts or what she was doing afterwards and only shows up ''once'' during the very end of the Buu Saga (and that's only in the anime because Akira Toriyama completely forgot about her and forgot how she looked).

** In The manga, there is a fight where Orochimaru summons two giant snakes. One is trapped in a swamp jutsu and later killed. The other injures Naruto and then is never seen again (not even as a puff of smoke which would indicate that it was de-summoned). The anime "corrects" this by having both snakes entrapped in the swamp; after attacking Naruto, the snake inexplicably sinks.
*** Summons in ''Naruto'' automatically return to where they came from eventually, so one can assume that's what happened to the second snake in the manga.
** Another comes a little while later: Hayate Gekko, the proctor for the third part of the chuunin exams, is killed by Baki when he finds out about the Sand and Sound village's plan to attack Konoha. When his body is a found, a female ANBU member named Yugao Uzuki turns out to be Hayate's lover, and swears revenge. She's never seen again, and when Baki and the whole Sand village pulled a HeelFaceTurn you're left wondering how she responded. One of the video games finally resolves the question, as if you start a match between Yugao and Baki, she will declare her desire for revenge at the beginning, and when using her special move.
*** Filler in the Shinobi World War arc goes into this a little [[spoiler: she's now a medic nin and gets called out to deal with Zombie!Hayate.]]

** There's also Hanabi, Hinata's sister, who is supposedly stronger/more promising than Hinata (which is ''before'' Hinata TookALevelInBadass, so it's unclear where she stands now), and was possibly favored for inheriting the clan. Since the arc of her first appearance, she's yet to do so again to further the Hyuuga relations/hierarchy subplot. For Pain's Invasion, she is implied to be away with her father for an unknown reason, but while Hiashi reappears [[spoiler:to fight in the Fourth Shinobi World War]], Hanabi has not.
*** Her absences are addressed in two filler episodes [[ADayInTheLimelight focusing her on point of view]] that aired right before the GrandFinale movie, ''Anime/TheLastNarutoTheMovie'', where she has a more central role. For the Pain's Invasion she was outside the village for a diplomatic outing with her father and for the [[spoiler: Fourth Shinobi World War]] she is shown seeing her father and Hinata off while she protects rest of the clan in the village.
** A minor example is Sasuke's Leaf headband. In their battle at the valley Naruto made an incredible fuss so Sasuke would wear it. After Sasuke leaves, one would think that an item, that represents his best friend's status as a Leaf shinobi, would be kind of important to Naruto and mentioned at least once during the long sessions of thinking about Sasuke in bed, but the headband was never shown again aside from two filler episodes.
*** [[spoiler: Naruto finally gives it back to Sasuke in the second to last chapter, 699]]
** What ever happened to Anko Mitarashi? Sasuke used her Curse Seal to revive Orochimaru a while back in the manga, several YEARS in real-world time... and just left her on the cave floor. The wiki stated that she was unconscious, not dead, and she has never appeared again, nor has any mention been made of her fate.
*** And Yamato? Also kidnapped because of his abilities and then... nothing. The current theory is that he's inside the Spiral Zetsu and being used to power his Mokuton jutsu.
*** [[spoiler: Yamato was held inside the Spiral Zetsu before being freed and then caught in the Infinite Tsukuyomi, before being freed from that with everyone else. Anko makes a very, very small cameo in the final chapter, 700, and Yamato makes a brief cameo at Naruto and Hinata's wedding in ''Anime/TheLastNarutoTheMovie''.]]
** What exactly was ''that technique''? At the beginning of the Gaara rescue are Jiraya pulls Naruto aside and tells him to not use ''that technique''. Naruto looks downcast and replies with "I know." And it is never mentioned again. Hundreds of chapters later, and nothing has come of it yet.
*** It is eventually clarified this was specifically using the Kyuubi's chakra due to his lack of control.
** The ending of the manga leaves the fates of some of the villains in the air. [[spoiler: Orochimaru and Kabuto]] are both seen being freed from the Infinite Tsukuyomi along with everyone else and are simply never seen or mentioned again. [[spoiler: Orochimaru returns in ''Manga/NarutoGaiden'', however, [[KarmaHoudini still up to his old tricks.]]]]

** The whereabouts and activities of [[spoiler:Graf Herman]] remain unclear, even though he survived his battle with Negi and promised that they would meet again. He suggested that he may know how to reverse the petrification cast on the inhabitants of Negi's village when he attacked it some time before the main story begins, but [[spoiler:by the WhereAreTheyNowEpilogue, Konoka went ahead and cured them anyway]] and he vanishes completely

*** The anime upgrades him to a member of the Oracion Seis during the Key of the Starry Heavens filler arc in the anime before being PutOnAPrisonBus a the end. Erik apparently didn't care enough to have him released so he presumably remained there.
** Oddly, despite Lucy acquiring Sorano's keys at the end of the Nirvana, her silver key Caelum is never seen again. Then again considering
** Obra was later seen with [[spoiler: [[BigBad Zeref]]]] only to never be seen again. [[spoiler:Fans [[WildMassGuessing speculate]] that the main reason for this was that ultimately Mashima couldn't think of a way around Obra [[AntiMagic power]] which would have likely made fighting him or fights around him ultimately impossible.]]

* ''Anime/MobileSuitGundam00'': During the first season, the politicians of the major power blocs played an important if supporting roles. But by Season 2, there's no mention of them after the time skip. The Union President does make a cameo at the season finale.
** The same thing occurs to Celestial Being's Observers, who apparently monitor the organization in one episode. They're never seen or mentioned again in the show.

* ''Manga/SayonaraZetsubouSensei'': Kaere's split personality. She had a YamatoNadeshiko personality in contrast to her panty shot, lawsuit-happy American personality. For all of 15 minutes.

* ''Manga/SayonaraZetsubouSensei'': Kaere's split personality. She had a YamatoNadeshiko personality in contrast to her PantyShot, lawsuit-happy American personality. For all of 15 minutes.