From the list I really like
George Smiley
Mrs. Ramsay
Philip Marlowe
Jeeves
The Cat in the Hat
Sam Spade
John Blackthorne form James Clavell’s novel “Shogun”. My second would be Frodo Baggins from “The Lord Of The Rings.”
How could they have forgotten--
Jack Ryan (all of the Tom Clancy novels, seemingly)
Lord Peter Wimsey (Dorothy L. Sayers, Gaudy Night)
Harriet Vane (Dorothy L. Sayers, Strong Poison)
Gandalf (The Hobbit, The Lord of the Rings trilogy) Katherine Vigneras (The Small Rain, A Severed Wasp , Madeleine L'Engle)
Hercule Poirot (Agatha Christie)
Artemis Fowl and Bunter(Eoin Colfer)
Aslan (The Chroncicles of Narnia, C.S. Lewis)
Father Brown (The Innnocence of Father Brown, G.K. Chesterton)
...and since they included The Cat in The Hat and Winnie The Pooh
The boy in Where the Wild Things Are -- Maurice Sendak
Tigger -- Winne the Pooh
Calvin and Hobbes -- Bill Watterson
Dilbert (and the Pointy Haired Boss)-- Scott Adams
Cheers!