These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Big Hero 6
The Disney film:
Acceptable Targets: Subverted. While Baymax is round and soft, the jokes about him being fat are not at his expense. They are all focused on the fact that Hiro is trying to force Baymax into a role (and armor) he was never designed to fill; he's a medical robot, not a fighting robot.
In the book, Hiro's Journal, Hiro calls murdering Yokai a win. Kind of makes you question his loose morals. Alternatively, this could just be the mindset of an angry, confused, and rather upset teenage boy. Tadashi's death upset him badly, and the idea that Yokai is behind it would be something anyone would be mad at, especially given how it's quickly revealed Yokai's secret identity was someone he looked up to and trusted and that someone outright said that Tadashi's death was Tadashi's own mistake. So rather than appearing like he just has loose morals, this could be argued as the thought process of a teenager who doesn't have a good outlet for his sadness.
Callaghan's expression at the end when he's arrested is up as a matter of debate, mainly over whether he feels guilt over his actions as Yokai or disappointment at being sent to prison and separated from the daughter he tried to avenge or possibly both.
With the amount of information given to the audience about the Silent Sparrow project (fairly little) it's impossible to tell if Callaghan was right about Krei cutting corners, or if Abigail was simply the victim of a horrible accident resulting from testing a hazardous new technology, and Callaghan wanted someone to blame.
Whether Disney adapting a Marvel property into an animated film is a revolutionary step for the Disney Animated Canon, or just an example of them forcing the Marvel Cinematic Universe into everywhere. For its part Disney has made little mention of Big Hero 6 being a Marvel property (aside from mentioning been "based on the Marvel comic series" in the trailer), and explicitly said it's not part of the MCU.
The mixed heritage the film shares between White and Japanese - notably the immigration of the comic's Japan focused setting to the now fictionalized amalgamation "San Fransokyo" and the apparent Race Lift with some of the cast (notably Honey and Wasabi). While some view this as a bold change by Disney to become the first animated film to prominently feature individuals of a mixed heritages, others compare the change unfavorably to The Last Airbender.
After the film's release, some people don't like how the only characters to get any Character Development are Hiro and Baymax, while others are glad that the movie didn't try to bite off more than it could chew by trying to tell too many stories.
Cargo Ship: Many shipped Baymax with soccer balls as soon as the first trailer was released.
A few people had compared Honey to Princess Uni-Kitty. Both female characters are openly feminine with big eyes and Hidden Depths. Plus their voices sound somewhat similar and they bounce when they walk.
Within the Disney Animated Canon; the fact that one of the core elements of this film is the relationship between two brothers hasn't escaped critics notice, considering that its immediate predecessor, Frozen was entirely centered around two sisters. Not necessarily compared in a bad sense however.
Another within Disney Animated Canon: how about that really cool and likable older family member who rescues our mischievous and young hero early on, gives them a lecture on being a better person, then dies and spurs on the hero's character development for the rest of the film, even beyond the grave. Mufasa, or Tadashi?
And then from its step-parent Marvel, a goofy big budget blockbuster film starring a mixed ethnic cast superhero team based on a relatively obscure comic series with a non-human sidekick that completely steals the show?: "Hello, I AM GROOT/BAYMAX!"
Cause we could be immortals, immortals Just not for long, for long And if we meet forever now, pull the blackout curtains down Just not for long, for long We could be immortals, immortals, immortals, immortals
Fanon: Since Honey and GoGo are only known by their nicknames, fans have speculated that their respective real names are Aiko Miyazaki and Leiko Tanaka, much like their comic counterparts. Though this is highly unlikely due to their Race Lift to Latina and Korean.
Much of the fanfiction and fanart out there depicts Tadashi as being alive with severe burn scars, but not much more, likely due to his Ensemble Dark Horse status. It's become a joke within the members of the fandom that the movie's canon must have been false. Tadashi's obviously just in some hospital healing, and will definitely be back in the sequel, if there is one.
When Hiro and Baymax are in the half-portal realm trying to save Abigail, you may see a beautiful landscape in the background constantly changing. This is a Mandelbulb set, a three-dimensional analogue to the Mandelbrot set.
Yokai's kabuki mask has red streaks on it. In kabuki theater, red symbolizes passion, alongside anger and cruelty. This makes much more sense after Yokai is revealed to be Callaghan, whose crimes are driven by passion for revenge, in anger over his daughter's death.
In Iron Man 3, Tony Stark reveals he still had a nanny when he was fourteen years old. Given that a nurse bot is a futuristic nanny, that pretty much describes Hiro.
Speaking of which, Season 2 of Avengers Assemble introduces Arsenal, a robot whose primary function was to serve as a companion and eventually goes on to perform a Heroic Sacrifice, only to get rebuilt by the lead protagonist. Doesn't that sound a lot like Baymax?
And in the episode "The Age of Tony Stark", a de-aged Tony looks a lot like Hiro.
A group of teenagers/young adults fighting a terrorist who wears a kabuki mask in a Culture Chop Suey city with some "bending" involved... Sound familiar? (Bonus points for one of the heroes being filthy rich.)
Callaghan crosses this upon his Redemption Rejection. Instead of listening to Hiro, he still insists on trying to murder Krei and tearing down his entire company, along with Hiro and his team. The ending hints, however, he may not be beyond redemption.
Hiro himself nearly crosses this when ordering Baymax to kill Callaghan, then when he fails plotting on finding him and finishing the job. Ultimately subverted when Tadashi's video has him come to his senses.
Shipping: Running rampant due to no canon couples. Hiro and Honey are particularly popular in this field.
Squick: Where does GoGo get so much gum? She doesn't. The junior novelization implies that she keeps chewing the same gum for days to weeks on end, and that being on the dashboard of a car and having floated up from the San Fransokyo bay will not stop her from putting it back into her mouth.
They Changed It, Now It Sucks: In the original Marvel comics the movie is inspired by, the team was based in Tokyo and everyone was Japanese. Disney's decision to change most of the characters' races is the biggest point of controversy (only their names are still the same), and there's also the setting being moved from Tokyo to the entirely fictional hybrid city San Fransokyo.
They Wasted a Perfectly Good Character: Hiro and Baymax's teammates didn't really get much development and had rather one-note personalities, but the film would probably go in a very different direction without their inclusion, especially since they were able to stop Baymax from killing Yokai.
They Wasted a Perfectly Good Plot: Hiro was holding the kabuki mask when he got angry at Callaghan. It would have been interesting to see what would have happened if put it on.
The Untwist: Krei is such an obvious choice for Yokai's true identity that the movie wouldn't even try to make it a twist if it was true. Although many viewers suspected it was Tadashi rather than Callaghan.