From classic Disney names – to characters inspired by Roald Dahl and Dr. Seuss books.
Here are 34 of the best submissions...
1. Charlie and the Chocolate Factory
Oakley, eight months. Photo: Jessica Rose Johnson
2. The BFG
Lacey aged 11, BFG. Photo: Lindsey Harrison
3. Disney princesses
Ivy, eight, as Belle, and Ada, three, as Cinderella. Photo: Laura Wheatley
4. Violet Beauregarde
Hallie, aged three, as Violet Beauregarde. Photo: Grace Spence