Give a brief character description of kamiyaya (William's friend?

Kamiyaya is a loyal and supportive friend of William, known for their calm demeanor and sharp intellect. They often provide guidance and a sense of stability, balancing out William's more impulsive nature.

He comes from a relatively wealthier family and often helps William by sharing books, ideas, and encouragement. Gilbert believes in William’s creativity and supports his dream of building the windmill, even when others doubt him.