Professor Callaghan

About

Professor Robert Callaghan, also known as Yokai, is the main antagonist in the 2014 animated film Big Hero 6. He is a professor at the San Fransokyo Institute of Technology and a mentor to Hiro Hamada. He is initially portrayed as a kind and supportive character but later reveals his true identity as Yokai, a masked villain. His appearance changes significantly when he transforms into Yokai, wearing a black and purple Kabuki mask and a dark, armored suit. He uses his knowledge of robotics and artificial intelligence to create a powerful suit for himself and an army of microbots. His primary goal is to exact revenge on Alistair Krei, whom he believes is responsible for the death of his daughter, Abigail.