A main character of the series Excel Saga. She has brown eyes and wavy reddish-brown hair that reaches her shoulder blades. In the anime her hair color was changed to dark blue-purple. Her name comes from the Hyatt chain of hotels.
Hyatt is a member of the organization ACROSS, an organization bent on world domination. She works and lives with her senior, Excel.
In the series, Hyatt has a very sickly constitution. She frequently coughs up blood and even occasionally succumbs to temporary moments of being dead lasting from several minutes to several hours.