Yokai
Robert Callaghan, also known as the supercriminal terrorist Yokai, is a major antagonist in the Kingdom Hearts Unlimited Saga, appearing in "Return of the Keyblade" as the penultimate boss of the San Fransokyo campaign.
He is the head of the San Fransokyo Institute of Technology and was Tadashi and his friends' professor and mentor. However, after a tragic incident involving his daughter, he becomes the villainous Yokai, determined to take revenge on those who wronged him. It is here that the HYDRA faction led by General Janna Hale takes an interest in Callaghan and recruits him to their organization as a super-criminal working in their best interests.
Eventually, Callaghan falls prey to the true darkness when, in his attempt to rebuild Project Silent Sparrow and use the dimensional gateway to destroy both Krei Tech and Alistair Krei himself, he ends up summoning an uncontrollable horde of Oni/Youkai to San Fransokyo, who then proceed to consume Callaghan and his Microbots, transforming him into a powerful Youkai Darkheart intending on destroying everything and everyone in its madness.
Story[]
Before Return of the Keyblade[]
(His backstory, how he used to work for SHIELD through Krei Tech, how he came up with the Yokai identity, and how he met up with both the Horned King and Janna Hale to become the embittered villain he is today)
Return of the Keyblade[]
(The plot of the Big Hero 6 movie combined with the plot of the world from KH III; aided by Pitch Black and Ultron in the role of the Riku Replica, who intend to use him as a puppet by manipulating his rage against Krei to open a gateway to Tartarus and unleash the Darkhearts upon San Fransokyo)
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