It's kinda hard to make blue characters with food. Can you think about any blue vegetables??
However, you can create nice blue color with purple cabbage!
What you need
1/4 purple cabbage
2cup Water (adjust the amount of water to get your desired color. More water you put, more light color you get)
A little Baking soda
Cooked white rice (When you cook rice, use a little less water than usual.)
1. Boil water and add cabbage. Cook until the water become purple like this picture.
3. Add blue liquid little by little too white rice.