In 'Inside Out', which emotion is the main character's leader for most of the film?

In 'Cinderella', what does Cinderella leave behind at the ball? In 'Up', what is the name of the talking dog? In 'Monsters, Inc.', what is the name of the little girl? In 'Monsters, Inc.', what is the name of Mike Wazowski's best friend? In 'Despicable Me', what are the yellow helpers called? In 'Ghostbusters' (1984), what is the name of the giant marshmallow creature? In 'Ghostbusters', what is the green ghost that the team first captures called? In 'E.T.', what candy does Elliott use to lure E.T.?