Which McDonald's character was introduced as the mayor of the fictional McDonaldland?

Mayor McCheese was introduced as the mayor of the fictional McDonaldland.

Mayor McCheese was a large character with a cheeseburger-shaped head, a face, a mayoral sash, and formal clothing. He appeared in McDonald's advertising alongside Ronald McDonald and other McDonaldland characters during the campaign's most prominent period.

McDonaldland gave McDonald's a shared fictional setting for its mascots. Characters such as the Hamburglar, Grimace, Birdie, and Officer Big Mac each had distinctive roles, while Mayor McCheese served as the town's civic leader.

The name can be confused with Officer Big Mac because both characters incorporated McDonald's food imagery and belonged to the same fictional world. Mayor McCheese's defining title, however, is mayor. The character was later reduced or retired as McDonald's advertising moved away from the full McDonaldland ensemble.