Kermit the Frog
From Disney's Hollywood Studios Wiki
Kermit the Frog, arguably Jim Henson's most famous Muppet creation, was the star and host of The Muppet Show, played a significant role on Sesame Street, and served as the logo of the Jim Henson Company. He continues to star in Muppet movies and make numerous TV appearances.
Kermit's most well-known catchphrase is "Hi-ho, Kermit the Frog here!" He typically introduced acts on The Muppet Show by waving his arms wildly and shouting "Yaaaay!" (a technique he learned from his old acting coach).
Kermit has been credited as the writer of three books: For Every Child, A Better World, One Frog Can Make a Difference, and Before You Leap.
 Studios Reference
Kermit the Frog is the main logo on just about anything doing with Muppet*Vision 3-D and is the host of the show, as well as being the host in Here Come the Muppets and Muppets on Location: Days of Swine and Roses.
Kermit's face is on most Muppet*Vision Merchandise, on the sign for the attraction, as well as the Hot Air Balloon above the attractions entrance.
A Kermit the Frog look a like made of spare parts can be seen in the queue for Star Tours.
 Character Synopsis
Kermit grew up in a swamp (supposedly in Florida or North Carolina). When a Hollywood agent finds himself lost in the swamp, he convinces Kermit that he has a lot of talent and should become a movie star. After a time in New York City, as part of the Seaseame Street News Flash team, Kermit fond his way to Hollywood, meeting fellow Muppet friends along the way. He has since hosted the Muppet Show, and appeared in many Movies.
During his Muppet Show days, he had a romantic relationship with fellow co-star Miss Piggy, but most of his recent interviews, he has said that they are now just business acquaintances, but she still texts messages him a lot.
 Preformed By
Kermit the Frog, as seen in every Disney Attraction to date, was preformed by Jim Henson.
Steve Whitmire has preformed him since Mr. Henson's Death.