When I think of boys with curls, particularly to fit the Kodona style, I think of the kind of cherubine curls you would see in old shoujou manga (above) and victorian greetings cards (below):
for longer hair, yes, i am once again using Mary Pickford as an example, but she really is a major style icon of mine! Here she is as little Lord Fauntleroy, with long ringlet curls!
Here is an example of short curls, shown on a live model. Also an example of a slightly older/ more grown-up look than the previous images.
An important aspect of curly hair is maintenance, and finding the right products for your hair.
If your hair is naturally curly, you'd probably benefit from softening and detangling products, such as leave-in serum.
If your hair is not naturally curly, and you're going to be using heat methods to style it, try and use a protecting spray, and a light-hold gel once you're finished to keep it in place.