My students had a blast drawing Manga faces again this year. I tried this lesson previously with great enthusiasm and results. I printed off lots of handouts I found online of cartoon faces, eyes, noses, mouths, hairstyles and accessories. The kids used these sheets plus books to put together their Manga portrait. 
I encouraged the students to include background patterns or accessories (such as a basketball) or a pet (like the dog) to tell a little about the character they had drawn. This would also be a fun project to tie in with Language Arts and have the kids write a story about their characters. 
Here are a few resource books about Manga you might want to check out.
