History YMMV / BigHero6TheSeries

** Karmi. Fans either hate her for being a BitchInSheepsClothing and being overly harsh to Hiro and Baymax to an extent with little provocation while being obsessively in love with Hiro's superhero alter-ego (not to mention [[ReplacementScrappy making it unlikely for the comic book character, Marys Iosama, to appear]]), or fans love her for her FriendlessBackground and potential for CharacterDevelopment, not to mention frequent moments where she is funny (the absolute peak of which being the episode [[MostFanficWritersAreGirls "Fan Friction"]]). It probably doesn't help that she knew about tadashi and still bullied Hiro. Seems to have become less contentious in Season 2, where her CharacterDevelopment has so far made her more amiable to Hiro and co. and the high stakes around her have made fans worried for her well-being. Look at AuthorsSavingThrow and RescuedFromTheScrappyHeap.

** Hiro and Tadashi's parents are stated to have [[ParentalAbandonment died when Hiro was three years old]] in the movie. All that is known of them is a picture of their father with their pregnant mother appearing ''' only''' in the Korean release of the movie. The series could've been a perfect occasion for seeing more of them as {{Posthumous Character}}s with flashbacks and seeing how Aunt Cass grieves her sister and brother-in-law while struggling to now raise her surviving nephew alone. They never got a single mention since the brief one from the movie.

** Hiro comes off as this in "The Dog Craze of Summer". While he should have been 100% focused on his job from the very start, he was saddled by Granville with three high-maintenance dogs and a really huge manual for the task at the last minute without prior notice. His poutiness when Cass takes his video games away and makes him take the job isn't unwarranted as he never actually volunteered to watch the dogs and he was forced into taking the job without being told what it was first. When Hiro and Baymax are out on the streets looking for Fermi, Hiro's refusal to read the manual is explicitly shown to not be out of laziness but out of a concern that they don't have time to go through it and that Fermi could be in a bad situation. Having the last of his dogsitting money stolen from him by a supervillain comes off as excessive punishment after he got stuck in a floor retrieving Fermi and had most of the money taken by his friends for their help.

** Hiro's teammates, with the exception of Baymax, can come off as this as well.

** The film shows Hiro has artistic talent when he draws the Silent Sparrow symbol. Given Karmi's own talent, this is something that could have been used to bond them.

* UnintentionallyUnsympathetic: Professor Granville comes off as rather inconsiderate in "The Dog Craze of Summer." She dumps her three high-maintenance dogs on Hiro at the last minute with a ridiculously huge amount of instructions and supplies for just one day of dogsitting when she would known ahead of time she had a conference. There is no reason given why she couldn't have called Hiro over to her home, which unlike the Lucky Cat, would presumably be prepped for three high maintenance dogs to roam around and presumably has a backyard. That she had time to arrange a truckload of supplies to be brought to the Lucky Cat shows she had time that could have been spent giving Hiro a proper walkthrough of how to do his job at her place. She also merely says the dogs have "quirks" rather than taking 20-30 seconds to explain the specifics. Adding to that, we see Baymax read the critical Mr. Pip instruction from the ''middle of the book'', when putting it on the front page could have allowed Hiro to retrieve Fermi when he saw him across the street. Instead, this causes the trouble to be dragged out until night. Given how easily the dogs seem to have been controlled with their toys at the end, the entire plot could have been avoided if she had merely left Hiro a 1 or 2-page list. Even her talk about Hiro having an abundance of free time and agreement with Cass about Hiro needing real-world work experience can come off as this considering that she is aware Hiro is the leader of Big Hero 6, who just stopped being fugitives from the law.

** Karmi. Fans either hate her for being a BitchInSheepsClothing and being overly harsh to Hiro and Baymax to an extent with little provocation while being obsessively in love with Hiro's superhero alter-ego (not to mention [[ReplacementScrappy making it unlikely for the comic book character, Marys Iosama, to appear]]), or fans love her for her FriendlessBackground and potential for CharacterDevelopment, not to mention frequent moments where she is funny (the absolute peak of which being the episode [[MostFanficWritersAreGirls "Fan Friction"]]). Seems to have become less contentious in Season 2, where her CharacterDevelopment has so far made her more amiable to Hiro and co. and the high stakes around her have made fans worried for her well-being. Look at AuthorsSavingThrow and RescuedFromTheScrappyHeap.

* UnintentionallyUnsympathetic: Professor Granville comes off as rather inconsiderate in "The Dog Craze of Summer." She dumps her three high-maintenance dogs on Hiro at the last minute with a ridiculously huge amount of instructions and supplies for just one day of dogsitting when she would known ahead of time she had a conference. There is no reason given why she couldn't have called Hiro over to her home, which unlike the Lucky Cat, would presumably be prepped for three high maintenance dogs to roam around and presumably has a backyard. That she had time to arrange a truckload of supplies to be brought to the Lucky Cat shows she had time that could have been spent giving Hiro a proper walkthrough of how to do his job at her place. She also merely says the dogs have "quirks" rather than taking 20-30 seconds to explain the specifics. Adding to that, we see Baymax read the critical Mr. Pip instruction from the ''middle of the book'', when putting it on the front page could have allowed Hiro to retrieve Fermi when he saw him across the street. Instead, this causes the trouble to be dragged out until night. Given how easily the dogs seem to have been controlled with their toys at the end, the entire plot could have been avoided if she had merely left Hiro a 1 or 2-page list. Even her talk about Hiro having an abundance of free time and agreement with Cass about Hiro needing real-world work experience can also come off as this considering that she is aware Hiro is the leader of Big Hero 6, who just stopped being fugitives from the law.

** Hiro comes off as this in "The Dog Craze of Summer". He gets saddled by Granville with three high-maintenance dogs and a really huge manual for the task at the last minute without prior notice. His poutiness when Cass takes his video games away and makes him take the job isn't unwarranted as he never actually volunteered to watch the dogs and he was forced into taking the job without being told what it was first. When Hiro and Baymax are out on the streets looking for Fermi, Hiro's refusal to read the manual is explicitly shown to not be out of laziness but out of a concern that they don't have time to go through it and that Fermi could be in a bad situation. Having the last of his dogsitting money stolen from him by a supervillain comes off as excessive punishment after he got stuck in a floor retrieving Fermi and had most of the money taken by his friends for their help.

* TheyChangedItNowItSucks: Several fans were very disappointed and a bit outraged with Creator/KharyPayton replacing Creator/DamonWayansJr as Wasabi and Brooks Wheelan replacing Creator/TJMiller as Fred, especially since ''everyone else'' of the original film reprised their roles. That's one of the reasons some fans tend to ignore the TV series. Though averted depending on the fans, who love Khary Payton as Wasabi (since they loved his work in ''WesternAnimation/TeenTitans2003'') and tend to '''''prefer''''' Brooks Wheelan over T.J. Miller, since Miller made a lot of controversy over the late 2010s.

* WinBackTheCrowd: Of all the Marvel cartoons released this decade, this has garnered the most positive reception not only due to the movie's positive reception but also how, just like the movie, Marvel has little involvement, leaving Disney itself to be more focused on crafting its world with the series.

* Fred in "Big Hero 7". While blabbing his secret identity to Richardson was a massive bone-headed move on his part, he was expected to comply with blackmail to make up for it.
* Hiro comes off as this in "The Dog Craze of Summer". He gets saddled by Granville with three high-maintenance dogs and a really huge manual for the task at the last minute without prior notice. His poutiness when Cass takes his video games away and makes him take the job isn't unwarranted as he never actually volunteered to watch the dogs and he was forced into taking the job without being told what it was first. When Hiro and Baymax are out on the streets looking for Fermi, Hiro's refusal to read the manual is explicitly shown to not be out of laziness but out of a concern that they don't have time to go through it and that Fermi could be in a bad situation. Having the last of his dogsitting money stolen from him by a supervillain comes off as excessive punishment after he got stuck in a floor retrieving Fermi and had most of the money taken by his friends for their help.

* WhatCouldHaveBeen: According to the showrunners, Karmi was meant to have a much bigger role in Season 3, including her arc to follow up on her brief reappearance in "Legacies", but due to the format change (going from 22-minute to 11-minute episodes and more of a focus on comedy), it had to be cut.

* UnintentionallySympathetic: Fred in "Big Hero 7". While blabbing his secret identity to Richardson was a massive bone-headed move on his part, he was expected to comply with blackmail to make up for it.
-Hiro also comes off as this in "The Dog Craze of Summer". He gets saddled by Granville with three high-maintenance dogs and a really huge manual for the task at the last minute without prior notice. His poutiness when Cass takes his video games away and makes him take the job isn't unwarranted as he never actually volunteered to watch the dogs and he was forced into taking the job without being told what it was first. When Hiro and Baymax are out on the streets looking for Fermi, Hiro's refusal to read the manual is explicitly shown to not be out of laziness but out of a concern that they don't have time to go through it and that Fermi could be in a bad situation. Having the last of his dogsitting money stolen from him by a supervillain comes off as excessive punishment after he got stuck in a floor retrieving Fermi and had most of the money taken by his friends for their help.

** Just like with [[WesternAnimation/BigHero6 the movie]], some fans are still convinced that Tadashi isn't dead, theorizing he might be revived or cloned by the BigBad{{s}}.

* TheScrappy: Chief Cruz for being the stereotype of the law enforcer who hates superheroes, even though Big Hero 6 had saved the city countless times. Even when the news mentions that crime has gone down to an all-time low thanks to the team in the first episode of Season 2, his illogical deduction that superheroes attract supervillains makes his hatred of superheroes seem to be out of nothing but spite. The hate towards him grew when he [[UngratefulBastard shrugs off Big Hero 6 saving his life and still wants them arrested]]. Not only that, but his annoying OverprotectiveDad tendencies toward Hiro for getting close to his daughter come off as hypocritical considering that he tries to date, Aunt Cass. Even after his backstory has been revealed, it made fans ''dislike him even more'' as his backstory is cliché and makes his hatred of superheroes selfish and mostly motivated by pride. While Megan Cruz is at least mentioned in Season 3, her father never makes any major appearances, quite possibly due to this tepid reaction.

** Honey Lemon is also this with how [[/NiceGirl sweet]], [[GenkiGirl cheerful]] and [[{{Adorkable}} dorky]] she is.

** [[https://twinsanity.co/2014/10/25/peeks-disneys-big-hero-6-factoids-trivia-and-assorted-stuff/ One article]] released before the film compared Wasabi to Cyborg from ''WesternAnimation/TeenTitans''. Jump three years later to this series, and he's voiced by Khary Payton, the voice of Cyborg.

** Hiro is still this as in the movie, where he can be quite a Main/{{adorkable}} nerd and occasionally socially awkward when talking to girls.
** Honey Lemon is also this with how [[Main/NiceGirl sweet]], [[GenkiGirl cheerful]] and [[{{Adorkable}} dorky]] she is.

* TheyChangedItNowItSucks: Several fans were very disappointed and a bit outraged with Creator/KharyPayton replacing Creator/DamonWayansJr as Wasabi and Brooks Wheelan replacing Creator/TJMiller as Fred, especially since ''everyone else'' of the original film reprised their roles. That's one of the reasons some fans tend to ignore the TV series. Though averted depending on the fans, who love Khary Payton as Wasabi (since they loved his work in ''WesternAnimation/TeenTitans'') and tend to '''''prefer''''' Brooks Wheelan over T.J. Miller, since Miller made a lot of controversy over the late 2010s.

* AuthorsSavingThrow:
** Some episodes of the series show Hiro using his glove magnets in more effective ways than latching on to Baymax, which makes up for Hiro being a brainy but powerless member of the team in the movie. Season 2 finally gives him his own distinct weapon in discs he can throw around that attach to objects and that have a magnetic pull, giving him more combat utility.
** In the original movie, some saw Yokai/Callaghan as UnintentionallyUnsympathetic for his NeverMyFault reaction when Hiro called him out on having caused Tadashi's death (as one would've expected Yokai/Callaghan, a vengeful PapaWolf himself, to empathize with Hiro's situation). Here, Yokai/Callaghan (in prison, of course) finally gives a proper HeelRealization about what he did to Hiro and his family, and later even refuses to tell Chief Cruz Big Hero 6's identities out of gratitude for saving his daughter.
** For those who felt that Krei's depiction in Season 1 as a typical CorruptCorporateExecutive was out-of-character for how he was depicted in the movie, WordOfGod has confirmed that Season 2 gives him CharacterDevelopment and HiddenDepths, which so far appears to be true.
** Karmi starts as a BaseBreakingCharacter. But as of Season 2's mid-season finale, [[spoiler:the trauma she's been put through which caused her to be PutOnABus]] caused a lot of fans to feel bad for her and appreciate her CharacterDevelopment.
** In "City of Monsters", we finally start exploring Tadashi's influence on the SFIT students outside the titular team by having Karmi tell Hiro how she admired him.

* DiagnosedByTheAudience:
** Wasabi is very obsessed with cleanliness and organization, hinting that he has a form of OCD. He's seen in one episode dipping each end of a french fry before eating both ends and throwing out the middle. Additionally, when something isn't where he knows he would put it (i.e., Honey's chem purse in the purse box), he undergoes sort of a HeroicBSOD.
** Being the most childish and eccentric member of Big Hero 6, Fred is at the point of it being AttentionDeficitOohShiny.
** Krei [[TroubledFetalPosition pulls his knees to his chest]] a lot when he's frightened or stressed, is rarely seen sitting down normally, has a keen sense of smell, is very expressive in terms of body language, and doesn't have the best understanding of non-verbal and subtle communication. All these traits are often seen in people on the autism spectrum.

** Some episodes of the series show Hiro using his glove magnets in more effective ways than latching on to Baymax, which makes up for Hiro being a brainy but powerless member of the team in the movie. Season 2 finally gives him his own distinct WeaponOfChoice in discs he can throw around that attach to objects and that have a magnetic pull, giving him more combat utility.

* MagnificentBastard: [[BigBad Obake]], real name [[spoiler:Bob Aken, was once the top student of Professor Granville. After an unsupervised lab experiment ended in disaster, Obake was left with a brain tumor that left him incapable of differentiating right from wrong]]. Fascinated by artist/scientist Lenore Shimamoto's work, Obake flawlessly manipulates both heroes and villains alike into acquiring Shimamoto's research as well the secret identities of Big Hero 6, taking a close interest in Hiro Hamada. He secretly observes and gauges the boy's growth from the shadows, even going so far as disguising himself as [[spoiler:Hiro's dead brother]]. In the season finale, Obake reveals his grand plan to [[spoiler:recreate Shimamoto's failed experiment that caused the Great Catastrophe, and [[InTheirOwnImage rebuild San Fransokyo into something "perfect"]]. He takes control over Baymax and captures Hiro in hopes of swaying him into becoming his [[WeCanRuleTogether protégé once the dust settles]]. Thwarted by the heroes, a heartbroken Obake lets himself [[GoingDownWithTheShip go down with his collapsing lair]], but not without freeing Baymax from his control to go back to Hiro and save the boy who he deemed his equal]]. A VisionaryVillain whose charming brilliance is rivaled by his ruthlessness, Obake establishes as Big Hero 6's most diabolical foe to date.

* TheyChangedItNowItSucks: Several fans were very disappointed and a bit outraged with Creator/KharyPayton replacing [[Creator/TheWayansFamily Damon Wayans Jr.]] as Wasabi and Brooks Wheelan replacing Creator/TJMiller as Fred, especially since ''everyone else'' of the original film reprised their roles. That's one of the reasons some fans tend to ignore the TV series. Though averted depending on the fans, who love Khary Payton as Wasabi (since they loved his work in ''WesternAnimation/TeenTitans'') and tend to '''''prefer''''' Brooks Wheelan over T.J. Miller, since Miller made a lot of controversy over the late 2010s.

* MagnificentBastard: [[BigBad Obake]], real name [[spoiler:Bob Aken, was once the top student of Professor Granville. After an unsupervised lab experiment ended in disaster, Obake was left with a brain tumor that left him incapable of differentiating right from wrong]]. Fascinated by artist/scientist Lenore Shimamoto's work, Obake flawlessly manipulates both heroes and villains alike into acquiring Shimamoto's research as well the secret identities of Big Hero 6, taking a close interest in Hiro Hamada. He secretly observes and gauges the boy's growth from the shadows, even going so far as disguising himself as [[spoiler:Hiro's dead brother]]. In the season finale, Obake reveals his grand plan to [[spoiler:recreate Shimamoto's failed experiment that caused the Great Catastrophe, and [[InTheirOwnImage rebuild San Fransokyo into something “perfect”]]. He takes control over Baymax and captures Hiro in hopes of swaying him into becoming his [[WeCanRuleTogether protégé once the dust settles]]. Thwarted by the heroes, a heartbroken Obake lets himself [[GoingDownWithTheShip go down with his collapsing lair]], but not without freeing Baymax from his control to go back to Hiro and save the boy who he deemed his equal]]. A VisionaryVillain whose charming brilliance is rivaled by his ruthlessness, Obake establishes as Big Hero 6's most diabolical foe to date.

** When Trina was introduced in "The Bot-Fighter", fans saw her as an alternate pairing for Hiro as she helped him with the underground bot fights and even kissed him after one. Not even the revelation that [[spoiler: she was a robot and Obake's creation]] was enough to deter them. Only after her breakdown and full descent into villainy did fans of her finally back off.
** Fans hopped off the Chris/Wasabi ship after Chris was revealed to be just as evil as Liv[[spoiler:/Di]]. Even in the AlternativeCharacterInterpretation of Chris' actions are related to his boss [[spoiler: implanting ideas into his mind]], fans felt like any possible crush Wasabi may have had on Chris was treated poorly and didn't head anywhere in the end (since Chris and Liv ended up being PutOnABus at the end of the "City of Monsters" arc).

*** The season 1 finale reveals that he [[spoiler: suffers from a brain injury that makes him unable to tell right from wrong as a result of an experiment gone wrong. The revelation throws into question how much of Obake's actions are of his own will. Was he an unfortunate victim of circumstances where his accident was his StartOfDarkness? Or was Obake already a science-obsessed maniac from a young age, and the accident was merely a catalyst that allowed him to cut loose? Obake seems fully aware of his condition, but refuses to have it treated since he actually [[EvilFeelsGood enjoys the freedom from a moral compass]].]]
*** [[spoiler: When Obake decides to seal his fate in his collapsing lair and refuses Baymax's aid, he takes off his chip from Baymax's system and pushes him to go save Hiro. Despite his inability to recognize right from wrong and his pleasure in villainy, Obake died doing the right thing. Did he [[DyingAsYourself regain some morals before dying]]? At the same time, his mercy towards Hiro, whose potential he acknowledges, can be seen as consistent with his belief that scientific progress trumps all, making his good deed appear to be a case of MoralSociopathy.]]

** [[spoiler: Trina]] in the season 2 finale, whose plan to destroy the city is not as difficult to stop as Obake's was in the season 1 finale, and who goes down in combat ridiculously easily.
** In the same finale, [[spoiler: Chief Cruz, who has been obsessed with bringing down Big Hero 6 for the entire season, changes his entire worldview and gives up on antagonizing them after they save his daughter. Given that he blamed a superhero for a villain placing his father in danger, it's odd that he didn't blame Big Hero 6 for Megan's predicament, as it ''could'' be argued that it happened because of them. The only difference between what happened to his father (which sparked his anti-superhero crusade) and what happened to his daughter (which ended it) is that his daughter survived.]][[note]]It could be argued that this was because Megan’s life was threatened by the Buddy Guardians, who were commissioned by Chief Cruz on his crusade against superheroes. He may have blamed himself for going too far and bringing in the Buddy Guardians that could have very well killed Megan, and he was grateful to BH6 for saving her.[[/note]]

** Karmi starts as a BaseBreakingCharacter. But as of Season 2's mid-season finale, [[spoiler: the trauma she's been put through which caused her to be PutOnABus]] caused a lot of fans to feel bad for her and appreciate her CharacterDevelopment.

* CryForTheDevil: Obake may be a MadScientist [[spoiler: who's willing to kill millions ForScience, but you can't help but feel bad for him when it's revealed that he's suffering from a brain injury that makes him unable to differentiate right from wrong. You'll ''definitely'' feel sorry for him when his plan is thwarted and he suffers a VillainousBSOD that causes him to be DrivenToSuicide.]]

** Megan for being a NiceGirl with a cool character design and getting along [[ShipTease very well]] with Hiro. [[spoiler: Her keeping the identity of Big Hero 6 a secret]] helps out.

** Liv[[spoiler:/Di]] Amara, the BigBad of Season 2’s first arc, is a young and attractive EvilutionaryBiologist who's very popular among fans.

** In "Issue 188", Wasabi jokes to Hiro to tell Karmi he has a clone so she doesn't doubt he's the superhero she's crushing on, to which Hiro replies Karmi will see through it. Then comes Season 2 where [[spoiler: the BigBad is an [[EvilDoppelganger evil clone]]]], and Karmi [[spoiler: never doubted for a second of Liv/Di's true colors]].
** In "The Hyper-Potamus Pizza-Party-Torium", Hiro being saddened over his friends potentially finding jobs in another city hits harder when you remember that people he cared about have always abruptly lived his life before; either they died (his parents and Tadashi), or they had to move out ([[spoiler: Karmi]]), and there was nothing Hiro could do to stop it.

* SugarWiki/HeReallyCanAct: Creator/AndrewScott is often known for playing [[HateSink slimy and despicable villains]]. However, fans were surprised by what an [[AlasPoorVillain immensely heartbreaking]] performance he made [[spoiler: in Obake's final moments]].

** How fans deal with [[spoiler: Obake's supposed death]]. Helps that his fate is vague and they NeverFoundTheBody.

** A theory in the ''WesternAnimation/KimPossible'' fanbase was that Kim was a [[RoboticReveal robot]] built by her father, who is a rocket scientist. ''Big Hero 6: The Series'' is created by the creators of ''Kim Possible'' and Kim shares her voice actress with Trina, who turns out to [[spoiler: be Obake's robot "daughter" who he built.]]

** Chris, Liv Amara's assistant in season 2, seems to be quite interested in Wasabi.
** Globby's relationship with Felony Carl in season 2. Globby's realization that Felony Carl is his OnlyFriend at the end of season 1 was accompanied by the line "If anything thing happens to me, tell Felony Carl he was my whole list," which is a slightly different context would be the closest the show has come to a LoveConfession from anyone. The bar is raised even higher in the first half of the series finale, "Krei-oke Night" when they perform a love duet.

* LauncherOfAThousandShips: Hiro is shipped with pretty much every girl in his age range, such as Karmi [[note]]they have a mutual passion for science even though she's a BaseBreakingCharacter[[/note]], Trina [[note]]they have a mutual passion for robotics though given that she's [[spoiler: Obake's robot daughter]], it's pretty much sunk, but it hasn't stopped anyone[[/note]], and Megan [[note]]she's the nicest of the three but has a police chief father who hates superheroes[[/note]].

* LoveToHate: Both {{Big Bad}}s, Obake and Liv[[spoiler:/Di]]. Although both commit horrible actions during their reign as the main antagonist of their respective seasons, fans can't bring themselves to hate them, finding them extremely good-written villains. Although it goes up a notch for Liv, as contrary to her, Obake showed himself to be extremely vulnerable [[spoiler: in his final moments]] and a case of TragicVillain. Liv, for herself, is a {{sociopath}}ic ManipulativeBitch who commits horrendous actions ForTheEvulz. Some fans state that as much as they love Liv as a villain, they can't bring themselves to ever forgive her for [[spoiler: manipulating and mutating poor Karmi and causing her departure from the second half of the season]].
* MagnificentBastard: [[BigBad Obake]], real name [[spoiler: Bob Aken, was once the top student of Professor Granville. After an unsupervised lab experiment ended in disaster, Obake was left with a brain tumor that left him incapable of differentiating right from wrong]]. Fascinated by artist/scientist Lenore Shimamoto’s work, Obake flawlessly manipulates both heroes and villains alike into acquiring Shimamoto’s research as well the secret identities of Big Hero 6, taking a close interest in Hiro Hamada. He secretly observes and gauges the boy’s growth from the shadows, even going so far as disguising himself as [[spoiler: Hiro’s dead brother]]. In the season finale, Obake reveals his grand plan to [[spoiler: recreate Shimamoto’s failed experiment that caused the Great Catastrophe, and [[InTheirOwnImage rebuild San Fransokyo into something “perfect”]]. He takes control over Baymax and captures Hiro in hopes of swaying him into becoming his [[WeCanRuleTogether protégé once the dust settles]]. Thwarted by the heroes, a heartbroken Obake lets himself [[GoingDownWithTheShip go down with his collapsing lair]], but not without freeing Baymax from his control to go back to Hiro and save the boy who he deemed his equal]]. A VisionaryVillain whose charming brilliance is rivaled by his ruthlessness, Obake establishes as Big Hero 6’s most diabolical foe to date.
* MisaimedFandom: Once again, some fans say that Tadashi should return and be more focused on in the series (ex. he should have been TheSixthRanger in "Big Hero 7" as opposed to [[spoiler: Richardson]]) even though the {{Aesop}} of the story is to keep your loved ones in your thoughts while you move on with your life, with the series continuing that lesson by showing the characters moving on with their lives.

** Fans felt that Obake crossed it when he [[spoiler: tricked Hiro into thinking that his dead brother was alive.]] This is even treated as one in-universe by [=GoGo=] and Wasabi, thinking that Obake crossed the line this time.
** It gets ''much'' worse in the season finale, [[spoiler: where he plans on recreating the Great Catastrophe to make an artificial star, despite knowing full well it will destroy San Fransokyo and kill millions of innocents]].
** [[spoiler: Liv Amara's clone Diane]] crossed it in "City of Monsters" when she [[spoiler: forcibly turned her 16-year-old intern Karmi who idolized her into a monster and kidnapped Hiro and Baymax to force them to cure the real Liv Amara. When they succeed, she tries to mutate Hiro and then force the monster Karmi to kill him since HeKnowsTooMuch.]]

** Comes back in "[[Recap/BigHero6TheSeriesS1E21CountdownToCatastrophe Countdown to Catastrophe]]" when [[spoiler: each member of the gang gets a DramaticUnmask after Professor Granville reveals that [[SecretSecretKeeper she knows full well]] that they're Big Hero 6. And later, Megan figures out Hiro's identity by connecting the dots from the SFIT fire, and matches Hiro's face out of costume to his face in costume.]]

* RescuedFromTheScrappyHeap: Karmi. She was a character with [[BaseBreakingCharacter mixed responses]] in the first season due to her harsh behavior towards Hiro and Baymax. But as Season 2 goes on, CharacterDevelopment hits her, and considering she's in the middle of the Sycorax mess unbeknownst to her, fans now worry for her safety. [[spoiler: This worry is justified when Liv gives Karmi an "upgrade" against her will in City of Monsters.]] After [[spoiler:being PutOnABus]], people who previously hated her now appreciate her CharacterDevelopment and [[spoiler:[[TheBusCameBack hopes she comes back]]]]. [[spoiler: They also appreciate her cameo in "Legacies" and were delighted by her return in "Big Chibi 6", which some consider one of the best episodes of the new 11-minute format]].

** Also Karmi/Megan, who did not meet since [[spoiler: Karmi gets PutOnABus at the end of the City of Monsters arc and only reappears for one episode in Season 3 and Megan does not appear at all in Season 3]].

** Sirque is an attractive AffablyEvil ClassyCatBurglar acrobat who [[spoiler: stole Krei Tech's Project Silent Sparrow portal technology to commit heists,]] who only appears in one episode before "Go Go the Woweroo" reveals she was arrested offscreen.

** Professor Granville and [[spoiler: Obake's]] relationship is never explored in-depth aside from flashbacks, and they don't meet each other until the final episode of Season 1. It's not helped by [[spoiler: Obake dying afterward. [[NeverFoundTheBody Probably]].]]

** ''City of Monsters'' reveals that [[spoiler: Liv Amara we knew is an evil clone Di, while the real Liv is terminally ill and in stasis.]] How does Granville, [[spoiler: her old friend,]] feel about it?
** We don't see Krei's reaction to [[spoiler: the Liv that he knew was a clone all along.]]

** [[spoiler: Monster!Karmi could've had a TheDogBitesBack moment and gotten back at Di for everything she's done to her.]]

** Trina only appeared three times before her BigBad role in "Legacies", two of them being minor appearances that barely reference her revenge scheme, which makes her being the antagonist in the finale too rushed. In the same vein, Trina shares only ''one scene'' in total with Obake before [[spoiler: his demise]] in Season 1. "Legacies" could've been a ''perfect'' occasion for a flashback that covered more ground on their father-daughter bond.
** Similar to ''WesternAnimation/LiloAndStitchTheSeries'', the show, in general, has received a lot of indignation from fans who were expecting the series to be as emotional as the movie. Prime examples include more flashbacks of Tadashi, how Hiro’s parents died, how the nerd gang came together, learning their backstories and real names, and how Baymax came to be.

* TheUntwist: Many fans had guessed that Liv Amara (or rather [[spoiler: Diane]]) would be the BigBad in Season 2. Perhaps expecting this to happen, the show does not make a big deal about this revelation and she's just casually shown to be the villain at the start of "Seventh Wheel".

- Hiro in "The Dog Craze of Summer."