Who is Charmian from Jack London and what is their importance?

Charmian was London's second wife. She is described as athletic and adventurous. Charmian traveled with her husband, typed his manuscripts, and even sparred with him in the boxing ring. He saw her as a kindred spirit. A portion of Dyer's biography is based upon Charmian's diaries, which provided him with a close look at London's later years.