Illustration of Manga is serious art. If there is one thing unique about drawing from Japan versus most western style sketches, its the Quality in details.
But be warned that Japanese manga and Anime are full of matured subjects not suited especially for young audiences. Choose the stories right and no harm can trouble the mind of a child.
And if anyone contest that Manga is for kids, then stop watching Marvel and DC action movies. These movies are comic based films.
Start learning to draw with manga. Try it