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Cass Hamada

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


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 towards them, but knows when to be strict and firm when necessary. 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. She is proud of her nephews and is not afraid to show it. She also appears to be rather oblivious, as Hiro was able to hide Baymax's existence from her (though it is unknown if she was suspicious of Hiro's activities after he set out to form the Big Hero 6 to catch Yokai).

Role in the film

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. She 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 cafe 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. She 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 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 then another before letting him go.

When Hiro returns home after nearly being killed by Yokai 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 Yokai. (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 they hug, 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 ceremony of a building dedication in Tadashi's name alongside Hiro, Mochi, Baymax and the other members of the Big Hero 6 team.


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  • 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 problem.
  • 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's never explained how Cass is Hiro and Tadashi's aunt---however, given that she's Caucasian but has a Japanese-language surname, it can be assumed that she's most likely their aunt-by-marriage (so assuming that she was married at one point, her husband was most likely the brother of Hiro and Tadashi's father).
    • However, it's also possible that Cass never married and was actually adopted by a Japanese family and thus took their last name.


v - e - d
Big Hero 6 logo

Film: Big Hero 6
TV series: Big Hero 6: The Series
Books: Manga | Big Hero 6 Big Golden Book | Big Hero 6 Little Golden Book | Big Hero 6 Chapter Book | Big Hero 6 Junior Novelization | Big Hero 6 Pictureback with Tattoos | Big Hero 6 Step Into Reading | Big Hero 6 Deluxe Step into Reading | The Art of Big Hero 6 | Big Hero 6 Ultimate Sticker Book | Big Hero 6: Hiro and Tadashi
Video games: Big Hero 6: Battle in the Bay | Big Hero 6: Bot Fight | Disney INFINITY series | Big Hero 6: Baymax Blast | Kingdom Hearts III | Disney Crossy Road
Music: Soundtrack

Disney Parks

Big Hero 6 Headquarters
Entertainment: Baymax Super Exercise Expo


Film characters: Hiro Hamada | Baymax | Tadashi Hamada | Go Go Tomago | Honey Lemon | Wasabi | Fred | Cass Hamada | Robert Callaghan/Yokai | Abigail Callaghan | Alistair Krei | Sergeant Gerson | Mochi | Mr. Yama | Fred's Father | Heathcliff
Deleted characters: The Fujitas


Big Hero 6 (team)


San Fransokyo | Lucky Cat Café | San Fransokyo Institute of Technology | Akuma Island


Microbots | Megabot | Baymax's Chip | Yokai's Mask | Little Yama | Silent Sparrow


Story | My Songs Know What You Did in the Dark (Light Em Up) | Top of the World (Greek Fire) | Immortals

v - e - d
Disney Crossy Road Logo

Mickey and Friends: Mickey | Minnie | Donald | Daisy | Goofy | Pluto | Fifi | Pete | Clarabelle Cow | Horace Horsecollar | Willie the Giant | Chip and Dale | Mortimer Mouse | Butch the Bulldog | Golden Harp
The Lion King: Simba | Nala | Shenzi, Banzai and Ed | Ostrich | Grub | Zazu | Rafiki | Timon | Pumbaa | Mufasa | Scar
Tangled: Rapunzel | Flynn Rider | Stabbington Brothers | Pug Thugs | Pascal | Maximus | Mother Gothel | The King | Captain of the Guards
Wreck-It Ralph: Ralph | Vanellope | Felix | Calhoun | King Candy | Taffyta | Candlehead | Surge Protector | Gene | Nicelanders | Rancis | Other Sugar Rush Racers | Sour Bill
Big Hero 6: Hiro Hamada| Baymax | Robert Callahagan | Go Go Tomago | Wasabi | Fred | Fred's Father | Tadashi Hamada | Cass | Yama | Alistair Krei
Zootopia: Judy Hopps | Nick Wilde | Flash | Clawhauser | Gazelle | Yax | Bogo | Mayor Lionheart | Bellwether | Doug | Finnick | Mr. Big | Mr. Otterton | Manchas | Gideon | Jerry Jumbeaux Jr.
The Jungle Book: Mowgli | Kaa | Baloo | Akela | Shere Khan | Colonel Hathi | King Louie | Bandar-Log Monkey
Alice Through the Looking Glass: Alice Kingsleigh | Dormouse | Tweedledee and Tweedledum | Bandersnatch | Bayard | White Queen | March Hare | White Rabbit | Mad Hatter | Absolem | Time | Humpty Dumpty | Red Queen
Pirates of the Caribbean: Jack Sparrow | Will Turner | Elizabeth Swann | Joshamee Gibbs | Tia Dalma | James Norrington | Marty | Cotton | Bootstrap Bill Turner | Pintel | Ragetti | Angelica | Blackbeard | Prison Dog
Aladdin: Aladdin | Jasmine | The Sultan | Prince Achmed | Gazeem | Razoul | Rajah | Iago | Abu | Genie | Jafar | Magic Carpet | Pink Flamingo | Beggar Jafar | Golden Scarab Beetle | Magic Lamp | Snake Charmer |


Toy Story: Woody | Jessie | Buzz Lightyear | Hamm | Emperor Zurg | Rex | Slinky Dog | Mrs. Nesbit | Bo Peep | Bullseye | Lenny | The Prospector | Mint in the Box Prospector | Trixie | Big Baby | Green Army Men | Babyface | Janey Doll
Inside Out: Joy | Sadness | Anger | Disgust | Fear | Bing Bong | Frank and Dave | Forgetters | Jangles
Finding Dory: Dory | Deb | Gurgle | Pearl | Sheldon | Tad | Gill | Bloat | Squirt | Nemo | Marlin | Jacques | Bubbles | Destiny | Bailey | Gerald | Hank | Crush
Monsters, Inc.: Boo | Smitty | Needleman | Waxford | C.D.A. Agent | Mike Wazowski | Celia Mae | Flint | Mr. Waternoose | James P. Sullivan | Randall Boggs | Roz | Phlegm | Tony | Simulation Kid | Garbage Kid | Harley | Spike

Disney Parks

The Haunted Mansion: Professor Phineas Plump | Maid | Gargoyle | Caretaker and Dog | Butler | Sally Slater | Executioner | Spider | Madame Leota

Start a Discussion Discussions about Cass Hamada

  • Is Hiro Hamada the next Peter Parker?

    9 messages
    • He is somewhat like Peter Parker.
    • Joseph8 wrote:He is somewhat like Peter Parker. I agree. Both have lost good men of their families(Peter losing his Uncle Ben, Hiro losing ...

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