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Professor Robert Callaghan was a professor at the San Fransokyo Institute of Technology and is the father of Abigail Callaghan. Also known as his alter-ego Yokai, Callaghan served as the main antagonist for the superhero team Big Hero 6 in the movie of the same name.
Once a renowned scientist, Robert Callaghan was an aspiring man with the ambitious hope of using his research to make the world a better place. He was recognized for his work in the fields of robotics and was the creator of Callaghan's Laws of Robotics as well as the Callaghan-Catmull spline. Later in his life, Callaghan became an instructor and the head professor at San Fransokyo Institute of Technology to mentor the new generation of prodigies. One of these students, Tadashi Hamada, admired him greatly. Though Robert was passionate about his own work, his daughter Abigail was the light of his life. Callaghan was shown to support Abigail up to adulthood, when she would become the test pilot for Krei Tech Industries under Alistair Krei. One day, Krei founded Project "Silent Sparrow", an experimental portal design meant to revolutionize teleportation technology. However, during the experimental test run, the portal experienced a malfunction and was forcibly shut down, trapping Abigail in the space between the portals. Callaghan, who was present during the test, snapped and in a fury tried to assault Krei, blaming him for losing Abigail. The event catalyzed a transformation in Callaghan—he began to descend into madness, growing more unstable and obsessed with revenge towards Krei. Ultimately, this would lead to Callaghan discarding any semblance of his former self and the birth of the villainous entity known as Yokai.
Robert was a highly intelligent man who sought to teach young people and make the world a better place. He doesn't like when people try to do things the easy way or try taking shortcuts to get to their goals.
When his daughter Abigail was lost, he believed her to be dead and was consumed by rage and desire for revenge against Alistair Krei and his company, who were responsible for it. He kept his daughter's "death" to minimum exposition and still appeared relatively calm after it, but behind the scenes, he plotted a way to get to Krei and destroy everything he had.
Upon getting ahold of the Microbots he faked his own death and became relentless, doing his schemes anonymously and in secret. Because of this, he did not care about hurting anyone getting in his way even if it was people that cared about him.
Still, after Abigail was revealed to be alive and brought back, Callaghan appeared to have regretted everything he'd done as he was incarcerated.
Callaghan is a man with grey hair, likely due to age.
Upon becoming Yokai he started wearing a white, yellow-eyed Kabuki mask with red stripes to hide his face and dressed in a black coat and clothes, using black gloves as well.
Powers and AbilitiesEdit
- Genius-level intellect: Callaghan was an inspiration to many young geniuses due to his many inventions and became the dean of the SFIT because of this. He had enough coordination to keep many Microbots doing different things at once.
- Neurotransmitter: A high-tech headband designed by Hiro and used to control Microbots, attached to a Kabuki mask to hide his true identity.
- Microbots: Callaghan stole Hiro's microbots and produced many more himself in secret, in order to attack Krei Industries.
Tadashi introduced Hiro to his friends at the Ito Ishioka Robotics Lab and before leaving, Hiro met Callaghan, who compared the young man to his daughter as both loved Bot Fighting, then told Hiro he could join the SFIT despite his age. Hiro was excited by this and created the Microbots to showcase at the SFIT student exposition hoping to join the school. Both Callaghan and Alistair Krei attended it, being impressed with Hiro's project. Krei approached Hiro first offering to buy the bots, but Callaghan then adviced Hiro not to do it or he wouldn't exploit his whole potential, also treating Krei with disdain. Hiro agreed not to do it and Krei left. After most people had already gone away from the exposition, Callaghan set the place on fire and shielded himself with the microbots to fake his own death. Unknowingly, the heroic Tadashi went in looking for the man, resulting in Tadashi's death from an explosion. Both were mourned by their friends and family at Lucky Cat Café.
Callaghan however still lived and adopted the identity of "Yokai" in order to work in secret to attack Krei Tech Industries to obtain revenge. Hiro managed to save a single encased Microbot which started acting weird, leading him and Tadashi's robot, Baymax, to an abandoned warehouse where they saw more Microbots being produced. Yokai spotted them and began chasing them, but both managed to escape. After their encounter, Hiro went to the San Fransokyo Police Department to file a report, but the man attending them acted skeptical and uninterested. Because of this, Hiro decided to take matters into his own hands, designing an armor for Baymax and giving him a battle chip to fight against the mysterious man.
The duo went back to the warehouse, but Yokai had already left the location empty of any trace. Hiro's Microbot once more tried to get with the rest of the bots and so they followed again, being taken to the pier where they met with Wasabi, Go Go, Fred and Honey Lemon since Baymax had contacted them to help Hiro's mood. While they all talked, Yokai appeared and began throwing crates at them and then they all got in Wasabi's car to leave the place. Hiro ordered Baymax to stay and attack, but Yokai easily beat the robot and plummeted on top of the car. They were chased by the man throughout the city streets and almost got trapped by the Microbots, but ended up thrown to the bottom of the ocean, saved by Baymax while Yokai got away once more and believing they had drowned. Baymax managed to scan the man during the chase.
Hiro and the crew went to Fred's Mansion where they were greeted by Heathcliff. Inside, Hiro showed them a drawing of the Silent Sparrow symbol which he could spot when Yokai was carrying parts to build a machine. Fred suspected Alistair Krei was the Yokai but everyone doubted it, then Baymax revealed some of the health data that he obtained from his scan. With the information, Hiro realized they could scan the whole city at once with an upgrade and find Yokai.
By that time, Yokai had moved his operations to Akuma Island, the same place where the Silent Sparrow project took place and lost his daughter. Hiro made upgrades to Baymax's armor and gave his new friends and himself suits as well to apprehend the man. When Baymax found a match on Yokai's scan, the team was taken to the island where they found out the truth about the Silent Sparrow project but still mistakenly believed Yokai to be Alistair Krei trying to bring back the project. Yokai then threw a block of cement at them and engaged the inexperienced team in a fight, easily defeating them but losing his mask in the process.
Hiro, upon seeing Callaghan's face and learning he was the Yokai, became angered about Tadashi's sacrifice being for nothing and Callaghan told him it was his own fault for going inside the building in the first place. This made Hiro snap and take out Baymax's healthcare chip, turning him into a killing machine and ordered to take out Callaghan rather than arrest him. While being attacked by Baymax, Callaghan recovered the mask and got away as the rest of the team tried to stop Baymax and put back his chip. Later, the team was picked up by Heathcliff and showed Hiro more of the test's recording, revealing that the pilot was Callaghan's daughter and finally realized that Callaghan wanted revenge for this.
Yokai moved his schemes faster and attacked at Krei Tech Industries when Alistair Krei announced the inauguration of a new campus, using the Microbots to hold the Silent Sparrow's portal pieces together. The portal opened and began sucking in all of Krei Tech slowly until Hiro and his team arrived and fought Callaghan once more. The team was caught again by Yokai's bots but Hiro made them try different methods to break free. Learning from his past mistakes, Hiro told them to attack the Microbots instead of trying to obtain the mask. The team did as they were told and so most of the Microbots were being sucked into the portal until Yokai ran out of bots to utilize. Finally, Baymax took the mask and destroyed it, causing the bots to stop and fall, dropping the portal as well. Baymax detected signs of life inside of the closing portal and went in with Hiro. Later, Hiro came out with a capsule containing Abigail Callaghan, but unfortunately, Baymax's body was left inside as the portal was shut, although he managed to give Hiro his healthcare chip. Callaghan was arrested while all this happened and could only look in sadness and disappointment at what he'd done.
After his arrest, Hiro's team was named Big Hero 6 and the attack was broadcasted in the news. The San Fransokyo Institute of Technology also had to look for a new dean following this, getting Professor Granville to replace him.
- Yokai - Yokai is the Japanese word for "spirit" or "phantom". Individually, the kanji used for the word is "bewitching" and "mystery". The term Yōkai can also refer to a class of supernatural spirits and monsters in Japanese folklore.
- Yokai is the only "super" character in the film who has no Marvel Comics counterpart, although he does bear a resemblance to Lord Deathstrike.
- Despite being given the name "Yokai" in marketing, Callaghan's Yokai identity is never referred to by name. Although he is the only one to have a codename for his alter-ego, as the other superhero characters have nicknames for both their referred name and codename.
- Baymax reveals his blood type is AB-negative.