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Have I been perfect? No! Do I know anything about children? No! Should I have picked up a book on parenting? Probably!
―Aunt Cass to Hiro and Tadashi[src]

Aunt Cass is a supporting character in Disney's 2014 animated feature film Big Hero 6. She is the aunt of the Hamada brothers, Hiro and Tadashi.


Official Description[]

Cass is the overworked but always-supportive guardian of brothers Hiro and Tadashi. The owner of a popular San Fransokyo bakery and coffee shop, Aunt Cass is proud, ebullient and thinks the world of her two genius nephews. She's always good for a laugh and ready with a hug, tirelessly there for support and a great home-cooked meal.[1]


Cass is a caring woman who loves her nephews above all else. She is very loving toward them, but knows when to be strict and firm when necessary, and can get very frustrated and stressed because of them. This is shown when she picks them up after they are released from prison. She hugs them and asks if they are okay before lecturing them semi-strictly about how much they worried her.

Cass seems very excitable, talkative, and is usually in a happy mood. She is also understanding and did what she could to help Hiro through his depression after Tadashi's death.

She supports and encourages the decisions of Tadashi and Hiro while wanting what is best for them, as she encourages Hiro to go to college as it is what Tadashi would have wanted. Cass is proud of her nephews and is not afraid to show it.

Physical appearance[]

Cass is a middle-aged, attractive woman with fair skin, green eyes, and short, brown, unkempt hair.

Her everyday outfit consists of a black V-neck shirt with very short sleeves, jeans with rolled-up sleeves that show off her ankles, a black belt, and umber flats.


Big Hero 6[]

Aunt Cass does not have a very big role in the film. However, she is clearly the mother figure for both Hiro and Tadashi. She first appears when she goes to the police station to pick up her nephews after they are arrested and released on charges of involvement in illegal bot-fighting. She hugs them and asks if they are okay before proceeding to lecture them about how worried she was for them and their irresponsibility. Cass states how she took them in despite not knowing much about children, not being the best mother figure, and possibly needing to pick up a book on parental guidance. She then proceeds to go to the kitchen to pick up some snacks to calm her stress and goes upstairs with the family's cat Mochi. Tadashi tries to talk Hiro out of bot-fighting before Aunt Cass eats everything in the cafe due to her stress.

She is next seen at the San Fransokyo Institute of Technology convention supporting Hiro and stating how proud she is of him and Tadashi to the audience after his display. In celebration of Hiro getting admitted into the Institute, she offers to cook dinner at the café for Hiro, Tadashi, and the rest of their friends free of charge. Tadashi asks her if he and Hiro can have some time by themselves, telling her they'll catch up, and she accepts. However, shortly after she goes to the car with everyone else, Tadashi dies in a fire at the convention hall.

She is shown at her house mourning Tadashi's death, being comforted by Tadashi's friends Fred, Honey Lemon, Go Go Tomago, and Wasabi and also attends his funeral with Hiro and the others. She brings Hiro his food as he is too upset to leave his room and continues to mourn Tadashi's death, for about a month or so. Cass notices his plate is untouched and tries to console Hiro and convince him to register for classes at San Fransokyo Tech as that it is what Tadashi would have wanted, but Hiro refuses to budge and she decides to give him space. Later, when Hiro notices Baymax leaving his room to track where the microbot is leading, Hiro follows but is caught by his Aunt Cass. He lies to her by saying that he is going to register for classes and she hugs him, happy to see that Hiro is finally out of his room and going to apply for college. She gives him a hug and a quick kiss and then another hug before letting him go.

When Hiro returns home after nearly being killed by Callaghan and trying unsuccessfully to report the incident to the police, Cass notices that he is home and is preparing wings for a special dinner in celebration of Hiro's "first day at college" and wants to hear about it. However, Hiro dodges this by saying that he has a lot of homework and assignments to catch up on from college and takes the wings to his room to hide Baymax from her. Hiro then sneaks past her while she is watching Frankenstein to go to the garage to create armor for Baymax and download a fighting chip so Baymax can fight back against Callaghan. (Her reaction to Hiro's absence and her suspicions of his whereabouts are not shown).

She is not seen again until the end of the movie when Hiro leaves for San Fransokyo Tech with his friends, and Hiro asks for one last hug as he takes the lunch she prepared and leaves for the college with her smiling as she watches him leave.

In the end credits, she is shown being acquainted with Baymax, implying that Hiro introduced her to him once Baymax would no longer expose Hiro's scheme of avenging his brother. However, it is unknown if she knows about the Big Hero 6, though it would seem unlikely. She is also seen in a newspaper photo attending a building dedication ceremony in Tadashi's name alongside Hiro, Mochi, Baymax, and the other members of the Big Hero 6 team.

Big Hero 6: The Series[]

Failure Mode 6

Aunt Cass in Big Hero 6: The Series.

Cass appears in the follow-up series as a recurring character, still oblivious to Hiro's double life as a superhero. Though usually playing a minor role, she has sometimes become an unwilling participant in the schemes of various villains. For example, in "Food Fight", Cass accidentally joins an underground cooking competition; despite her eventual love for the sport, her winning streak gets her into trouble with a rival chef/supervillain named Momakase. In "Aunt Cass Goes Out", Cass meets Alistair Krei while visiting Hiro at school, and develops a relationship with him. Around that time, unfortunately, one of Krei's affiliates hatched a scheme against Krei, in which Cass was unintentionally dragged into. In both episodes, Cass has been implied to have some interest in having a life outside of running the café and parenting Hiro—ironically, the events of both episodes left her sour to the idea.


Baymax - Cass (4)

Cass forced to rest her sprained ankle.

Cass appears in the first episode of the mini series. While working, she trips over a step ladder and sprains her ankle. Her cry of pain alerts Baymax who comes to assesses her injury. He forces her to rest upstairs and tells her that she would need to close the café for five to seven days. Cass does not want to disappoint her customers, so Baymax decides to run the café for her. This does not ease Cass however. So, she attaches a camera to Mochi and sends him to spy on Baymax, only for the camera to dangle. So, she resorts to checking on Baymaz herself and, true to her fears, sees that he is performing too slowly for the customers.

Cass takes it upon herself to try and do the work around the café, but Baymax continues to stop her and send her back upstairs. During one final attempt, Cass once again trips over the step ladder and injures her ankle even more. She admits to Baymax that running the café is important to her as the customers are like family and she is afraid of them leaving her. Baymax tells her that while customers go to other places, she is irreplaceable. Baymax takes Cass down to close the café and discover that Mochi's camera still recorded the days events. It is revealed that her customers saw the camera and recorded a get well video for Cass; thanking her for her hard work.

Cass returns in the last episode "Baymax", now wearing a boot designed by Hiro. When both she and Hiro realize Baymax is missing, they go out to look for him, accompanied by Baymax's other patients, Kiko Tanaka, Sofia, Mbita, and Yachi. Together find Baymax in a abandoned warehouse that is about to be demolotion and save him just in time.

Other appearances[]

In Ralph Breaks the Internet, Aunt Cass appears in a cameo on an advertisement for "sassy housewives that want to meet".

In Once Upon a Studio, Cass is seen watching happily as Fairy Godmother enchants Goofy to float, allowing him to set up the camera safely, and is later seen singing the end of "When You Wish Upon a Star" with all the other Disney characters, as the photo is successfully taken.


The Disney Wiki has a collection of images and media related to Aunt Cass.


  • According to the 2013 Rotoscopers video and early development stages of the plot, Cass was originally Hiro and Tadashi's mother instead of their aunt. The reason for this change is yet to be verified, although it remains in the Japanese text of the manga adaptation, Baymax along with some elements left over from the early stages.[2]
  • She has a stress eating and cooking problem.
  • In early concept art, as well as the initial model renderings, Cass had a noticeable tattoo on her left arm. In the final film, the tattoo is completely gone. The reason for this has not been confirmed.
  • She has stated that she has not always been the best of role models despite seeming to be an encouraging and loving guardian to her nephews.
  • She originally had a larger role in Hiro's anxiety complex over Tadashi's death, and the film's concept art shows that she was present with Hiro in the "Tadashi is here" scene.[3]
  • It is revealed in "Aunt Cass Goes Out" that she has never dated before Alistair Krei and, by extension, has never been married.
    • To go off of that, since Cass never married and Hiro and Tadashi are confirmed to be half-Japanese through their father's side (while their mother was white), it can be assumed that Hiro and Tadashi's mother was Cass' sister. This would make Cass the biological maternal aunt of the brothers rather than their aunt-through-marriage.
  • In "Trading Chips", Cass reveals that she used to play softball in college while displaying some athletic ability.
  • In Baymax!, Cass states that she made a promise to look after her family, which apparently also extends to the café. This would imply that she inherited the establishment from Hiro and Tadashi's parents.


External links[]

v - e - d
Big Hero 6 logo
Films and Television: Big Hero 6 (video/soundtrack) • Big Hero 6: The SeriesBig Chibi 6: The ShortsBaymax!

Books: MangaThe Art of Big Hero 6Comic Books
Video Games: Big Hero 6: Battle in the BayBig Hero 6: Bot FightDisney Infinity seriesBig Hero 6: Baymax BlastKingdom Hearts IIIDisney Crossy RoadDisney Emoji BlitzDisney Magic KingdomsDisney Heroes: Battle ModeDisney Sorcerer's Arena

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Original: Hiro HamadaBaymaxTadashi HamadaGo Go TomagoHoney LemonWasabiFredAunt CassRobert Callaghan/YokaiAbigail CallaghanAlistair KreiSergeant GersonMochiYamaMr. FredericksonMrs. FredericksonHeathcliffJudyThe Ringleader

The Series: Professor GranvilleObakeBaron Von SteamerKarmiHigh VoltageRichardson MoleGlobbyFelony CarlMomakaseMad JacksMini-MaxMr. SparklesWendy WowerTrevor TrengroveNoodle Burger BoyLenore ShimamotoTrinaLiv AmaraDi AmaraOrso KnoxMegan CruzChief CruzChrisAC and DCNega-GlobbyMayoiSupersonic SueHardlightRoddy Blair
Baymax!: Kiko TanakaSofiaAliMbitaYukioYachi
Deleted: The Fujitas

Big Hero 6: The Series

Shorts: "Baymax and Fred" • "Baymax and Go Go" • "Baymax and Wasabi" • "Baymax and Hiro" • "Baymax and Mochi" • "Baymax and Honey Lemon" • "Baymax Dreams of Too Many Baymaxes" • "Baymax Dreams of Evil Sheep" • "Baymax Dreams of Bed Bugs" • "Baymax Dreams of Mochizilla" • "Baymax Dreams of Too Many Freds"
Season One: "Baymax Returns" • "Issue 188" • "Big Roommates 2" • "Fred's Bro-Tillion" • "Food Fight" • "Muirahara Woods" • "Failure Mode" • "Aunt Cass Goes Out" • "The Impatient Patient" • "Mr. Sparkles Loses His Sparkle" • "Killer App" • "Small Hiro One" • "Kentucky Kaiju" • "Rivalry Weak" • "Fan Friction" • "Mini-Max" • "Big Hero 7" • "Big Problem" • "Steamer's Revenge" • "The Bot Fighter" • "Obake Yashiki" • "Countdown to Catastrophe"
Season Two: "Internabout" • "Seventh Wheel" • "Prey Date" • "Something's Fishy" • "Nega-Globby" • "The Fate of the Roommates" • "Muira-Horror!" • "Something Fluffy" • "Supersonic Sue" • "Lie Detector" • "Write Turn Here" • "City of Monsters" • "Mini-Maximum Trouble" • "El Fuego" • "The Globby Within" • "Hardlight" • "The Present" • "Hiro the Villain" • "Portal Enemy" • "Fred the Fugitive" • "Major Blast" • "Fear Not" • "Legacies"
Season Three: "The Hyper-Potamus Pizza-Party-Torium" • "Mayor for a Day/The Dog Craze of Summer" • "Trading Chips/Mini Noodle Burger Max" • "A Friendly Face/Big Chibi 6" • "Cobra and Mongoose/Better Off Fred" • "Big Hero Battle/Go Go the Woweroo" • "The New Nega-Globby/De-Based" • "The MiSFIT/Return To Sycorax" • "A Fresh Sparkles/Noodle Burger Ploy" • "Krei-oke Night/The Mascot Upshot"

Baymax!: "Cass" • "Kiko" • "Sofia" • "Mbita" • "Yachi" • "Baymax"

Big Hero 6
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