Baymax is a robotic synthformer created by the young genius Hiro Takachiho when Hiro lost his father. Baymax was seemingly built to be just a bodyguard but soon helped fill the void left by his father's death, certainly helped by the fact that Hiro installed many of his father's memories and emotions into Baymax's core programming. When Hiro was drafted into the Japanese hero group, Big Hero 6, Baymax came along for the ride.