Who is William James Henry from The Monstrumologist and what is their importance?

William James Henry is a young boy who lives with Dr. Warthrop as a monstrumologist apprentice. Will Henry's parents were killed in a fire. Having no relatives, Will was taken in by Dr. Warthrop, who was his father's employer. Will is a kind and gentle boy, whose love for his parents has not lessened following their death. Will misses them dreadfully and although he admires Dr. Warthrop, he does not love him, primarily because Warthrop is incapable of loving others. Will Henry is obedient, and takes care of the doctor, and tries his hardest to learn from him, as he does recognize the doctor's genius. However, Will often dreams of running away as he is unhappy. But Will also realizes that the doctor is all that he has and that he is all that the doctor has.