Get ready to have your face melted... You're gonna feel these things tomorrow.

Aunt Cass is a supporting character in Disney's 2014 animated featured film Big Hero 6 and the follow-up TV series. She is the hard-working and supportive loving aunt of Hiro Hamada and the late Tadashi Hamada, as well as the owner of the popular Lucky Cat Café.


Cass is a relative of Tadashi and Hiro's parents. After the death of the boys' parents when Hiro was 3 years old, she took care of both children and raised them herself.

For the following ten years, Cass did the best she could despite knowing nothing of parenting and becoming too worried something bad could happen to them.

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.[2]


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 about how much they worried her.

Cass seems very excitable, talkative and is usually in a happy mood. Cass is also very business-savvy and hardworking from managing restaurant and home simultaneously, which has rubbed off into her firm but motherly nature. 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 with Big Hero 6.

Cass also has a creative streak, which she integrates into her work. As a talented chef, she can make many delicious dishes that have a great reputation to the regulars at her restaurant. She also comes up with special events held at the café to attract new customers, such as poetry readings because of her love for poetry.


Cass is a Caucasian female with green eyes and wavy brown hair. Typically tied to her home which doubles as a cafe, Cass usually wears comfortable and casual clothing, her main apparel being a simple short sleeved v-neck and a pair of capris, topped off with an apron when on the job and a silver-turquoise necklace that she never seems to go without.


When Hiro and Tadashi get arrested on charges of involvement with bot-fighting, Cass pays for their release and comes to pick them up at the police station. She hugs them and asks if they are alright, then proceeds to take the two by ear and chastises them about how worried she was for them and their irresponsibility. The family returns home to the café, where Cass scolds them about the lengths she has gone to raise them as best as she could and begins stress eating to calm herself down as she departs upstairs with the family's cat, Mochi. After hearing her speech, Tadashi tries to talk Hiro out of bot-fighting before Aunt Cass eats everything in the café from stress.

Soon, Hiro decides to enroll into Tadashi's university, San Fransokyo Institute of Technology, and spends the next few months working on his admittance project; Cass takes care of Hiro when he gets exhausted during the run. When the university's convention rolls around, Cass attends the convention with Tadashi and his friends to support Hiro where she tells Hiro how proud she is of him and Tadashi after Hiro's presentation display. In celebration of Hiro's acceptance into the Institute, she offers to cook dinner at the café for the party 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, a fire starts at the convention hall, which takes Tadashi's life.

Along with Hiro and the others, Cass attends his funeral and holds a memorial for Tadashi at the café. Cass mourns Tadashi's death and is comforted by Tadashi's friends FredHoney LemonGo Go Tomago and Wasabi. For Hiro however, the boy falls into a deep depression; during this time Cass tries her best to make Hiro feel better and brings him his food though Hiro is too upset to eat. She tries to console Hiro and convince him to register for classes at SFIT as that it is what Tadashi would have wanted, but Hiro refuses to budge and she decides to give him space. A while later, when Hiro notices Baymax leaving his room to track where the microbot is leading, Hiro follows but runs into Cass before he can exit the café. 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.

Baymax's body was lost during their fight, but Hiro and his friends defeat Yokai and have him arrested. Following this, Cass prepares a lunch for Hiro as he heads off to SFIT with his friends and they hug, though 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.

After Hiro's acclimation to college, he rebuilds Baymax and both go to Lucky Cat Café where Baymax helps Cass in picking up a lot of dirty dishes, then Cass becomes happy to see the robot again. She is also seen in a newspaper photo attending a ceremony of a building dedicated to Tadashi alongside Hiro, Mochi, Baymax and the other members of the Big Hero 6 team.


Hiro Hamada

Cass is Hiro and Tadashi's aunt. Hiro tends to stress her out and cause her to "stress eat" due to his illegal bot fighting, though she loves him nonetheless and vice versa. She is very supportive and proud of his abilities and was overjoyed when his Microbot exhibition won him an invitation to attend the San Fransokyo Institute of Technology.

Like Hiro, she also mourned the passing of Tadashi. She would bring food to Hiro after Tadashi's death as Hiro fell into a severe state of depression and refused to leave his room for two weeks. She tried to encourage him to go to college because Tadashi would've wanted it and she wanted him to recover, but he remained silent and she decided to give him space. When Hiro left his room for the first time in two weeks and he lied about going to register for classes (he was really going to catch up to Baymax), she was overjoyed and hugged him.

Overall, the two have a positive relationship and are close, especially since now they are the only known close relatives each other has. However, it is interesting to note that Hiro is keeping his superhero persona a secret from her. This is most likely because she has been shown to worry about Hiro and disapproves of him doing dangerous activities (such as bot fighting) and after Tadashi's death, she might forbid him to continue being a superhero as it would put his life at risk.

Tadashi Hamada

Cass had raised Tadashi and Hiro for a decade since their parents died, although she admits that she's not perfect. However, Tadashi hated making her upset and tried his best to make her proud, encouraging Hiro to do the same.

Go Go, Honey Lemon, Fred and Wasabi

Cass has basic and friendly relation with Tadashi and Hiro's friends However, after Tadashi's death they attend his memorial at her home and comfort her during the hard time.


Though in the film she appeared oblivious to Baymax's existence, in "Baymax Returns" she is happy to see him and says "he's back", implying that either Tadashi or Hiro introduced the robot to her at some point (likely during the time Hiro was building his Microbots with Tadashi and their friends, due to the many group pictures they took).

Still, Hiro has to be careful so that Baymax doesn't accidentally reveal their superhero identities to her.


  • Early stages of the plot and the 2013 Rotoscopers video show that Cass was going to be Hiro and Tadashi's mother rather than aunt. This was closer to the Marvel Comics version, where Maemi Takachiho was Hiro's widowed mother.
  • Concept art showed her with white hair streaks and a tattoo on her arm. Though both of these elements were removed in the final design, she has both in the film's credits.
  • She is called Cass Hamada in Japanese translations only.[1][3]
  • Cass makes a cameo in Wreck-It Ralph 2 on an advertisement that reads "Sassy housewives want to meet you today!".



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Aunt Cass.