Which fictional character first appeared in the novel "The Little White Bird"?

"The Little White Bird" is a British novel by J. M. Barrie, ranging in tone from fantasy and whimsy to social comedy with dark, aggressive undertones. It was published in November 1902. The book attained prominence and longevity thanks to several chapters written in a softer tone, which introduced the character and mythology of Peter Pan.

James Matthew Barrie, (9 May 1860 – 19 June 1937) was a Scottish novelist and playwright, best remembered as the creator of Peter Pan. He was born and educated in Scotland and then moved to London, where he wrote a number of successful novels and plays. He met the Llewelyn Davies boys, who inspired him to write about a baby boy who has magical adventures in Kensington Gardens and then write "Peter Pan, or The Boy Who Wouldn't Grow Up", a "fairy play" about an ageless boy and an ordinary girl named Wendy who have adventures in the fantasy setting of Neverland.

The Peter Pan story began as one chapter and grew to an "elaborate book-within-a-book" of more than one hundred pages during the four years Barrie worked on "The Little White Bird".

The story is set in several locations; the earlier chapters are set in the town of London, contemporaneous to the time of Barrie's writing, and involving some time travel of a few years, and other fantasy elements, while remaining within the London setting. The middle chapters that later became "Peter Pan in Kensington Gardens" are set in London's famous Kensington Gardens.