Kermit the Frog

Origin
Kermit the Frog is a Muppet character and Jim Henson's most well-known creation. Introduced in 1955, Kermit serves as the straight man protagonist of numerous Muppet productions, most notably Sesame Street and The Muppet Show, as well as in other television series, films, specials, and public service announcements through the years. Henson originally performed Kermit until his death in 1990.

While performing, Henson would always refer to Kermit as an individual and even had a seat made for him when not in use. Henson's family have stated Kermit's portrayal "came out of his own personality—was a wry intelligence, a little bit of a naughtiness, but Kermit always loved everyone around and also loved a good prank."

Effects
Formed from the devotion Henson had to his creation, when a puppeteer "wears" Kermit, they will begin to act as though he is an actual conscious individual. Though aware he is a puppet and not organic, they are mostly unaware of their actions as the controller.

Perhaps because of this effect they display significant resistance to removing their arm from Kermit, as it is interpreted as him "dying". Attempting to force this act can cause significant distress to the affected, although it will quickly vanish upon removal.

Interestingly, conversations with Kermit have led to revelations that only he would know, such as details about Jim Henson's personal life and anecdotes about events that occurred during previous uses, things which the individual puppeteering him would have no way of knowing.