Baymax is a healthcare companion robot designed by Tadashi Hamada in the Disney animated series "Baymax!" and the film "Big Hero 6." Programmed to provide assistance and medical care, Baymax is characterized by his gentle demeanor and inflatable, marshmallow-like body. He plays a vital role in helping Hiro Hamada, Tadashi's younger brother, cope with loss and discover his potential as a hero. Baymax's caring nature and dedication to helping others make him an endearing and pivotal character within the series, often providing comic relief and emotional support.