Baymax was created by the brilliant Tadashi Hamada as a healthcare providing nurse to improve healthcare around the world in order to help people. The process in creating Baymax was arduous and difficult, but Tadashi's desire to use his potential to benefit humanity never tarnished, so he worked eagerly on Baymax in hopes of inspiring his younger brother, Hiro, to use his genius like Tadashi did. To provide Baymax his programming and personality, Tadashi generated a healthcare chip encoded with the inscriptions that made Baymax the health-oriented and lovable robot he truly is. The chip also prevents Baymax from harming humans; without it, this limit is compromised.
Baymax is instantly activated by the sound of distress, and can only deactivate once his current patient states "I am satisfied with my care." If not, he will not stop helping nor leave unless the patient confirms their satisfaction.