He is an inflatable white robot with his metal parts built from inside. They are only visible when one looks deep inside through his inflatable vinyl material. Baymax's external structure resembles the appearance of a snowman, or, as Hiro calls him, a big marshmallow. A small badge-shaped access port is placed on the left side of his chest that can hold four cartridge chips to contain his programming.
He is based on the Marvel character of the same name from the Marvel Comics series, Big Hero 6.
This tag implies the following tags: big_hero_6