That's such a good question I'm going to have to do a top ten.
1. Dakin - The Farthest Away Mountain, Lynne Reid Banks
2. Aravis - The Horse and his Boy, C.S. Lewis
3. Jim Hawkins - Treasure Island, Robert Louis Stevenson
4. Foaly - Artemis Fowl, Eoin Colfer
5. Bartimaeus - The Bartimaeus Trilogy, Jonathan Stroud
6. Hanuman - Indian Legend
7. Bonnie - The Wolves of Willoughby Chase, Joan Aiken
8. Bilbo Baggins - The Hobbit, JRR Tolkien
9. Jess the Squirrel Archer - Mossflower, Brian Jacques
10.The Very Hungry Caterpillar - The Very Hungry Caterpillar, Eric Carle
I'm mildly surprised that Dakin's on the top there. I suppose it's because The Farthest Away Mountain is such a marvellous example of children's fantasy, it has absolutely everything I require from the genre.
A lot of people put characters from Narnia, mainly Lucy. But I'm going with Aravis, because unlike the characters from Earth, we first meet Aravis wearing her brother's armour, riding a talking horse across Calormen, seeking freedom in Narnia and the north. And when the book is over, Aravis doesn't have to go back to school - she stays there! Oh yes, I'm very happy with my choice.
Nobody from Harry Potter made it onto my list, because by book seven they all annoyed me so much I haven't actually read any of the books since - there's no way I want to actually be one of them.
Have to say though, nobody on my list has a particularly easy ride. That's why they're interesting characters.
Oh, except the Very Hungry Caterpillar :) What a classic.