.... do not use Tetsuya Nomura's work for a model. D:
ESPECIALLY Kingdom Hearts.
As amazing as he is, and as wonderful as his drawings are... they're absolutely no help at all to you when you're still in the learning process and getting the basics of anatomy down. It reflects badly in your work, and your art suffers.
The reason he can do it is because he's most probably learned the proper way to draw a figure, and stylized off of what he learned. It's what's most plausible. ... doing that will help you.