Anime and manga is a multi-million dollar industry in America and Canada alone. With more and more people wanting to learn how to draw manga artist have put out countless how to draw books and video tutorials.
Chris Hart, author of books like Manga Mania and Manga for the beginner gives you three tips on how to draw manga
Concentrate on proportion: Every character has an ideal proportions based on what genre their in. every sub-genre has a preferred character they want for that genre. Chibi's happen to appear in a lot of anime and manga in all types of genres. Chibi's often have very big heads and small bodies. Other characters look more like ordinary everyday people, and some look like they've spent their entire like in a gym.
Make mistakes: Even the most professional manga artist makes mistakes, it's okay. This gives you a chance to experiment with different characters and styles to find your own. Don't worry about the lines and eraser marks, you can always trace the finished drawing onto a clean piece of paper.
Originality: Taking a character from a manga you've read or even from your imagination and change it in steps. Maybe start with the features, like hair, eyes, mouth, etc. then with clothes, if they're one thing in the manga make them something completely different in your drawing. Make sure that when your done it looks nothing like the original character.
Something you should figure out before you start draw a manga character. Try to find what your comfortable drawing, you have not be comfortable drawing men like Natsuki Takaya artist of the manga Fruits Basket, then focus on what you do like to draw. Don't draw a character for the sake of drawing one, draw one your really passionate about, ones you won't get tired of later.