The male protagonist of the story. He is the eldest son of the "House of Jones", a very wealthy merchant middle class family that has risen to the gentry. As his father's heir, he is under tremendous stress to not only take over the family business but also marry a girl from another wealthy family, preferably into the peerage. He develops feelings for Emma after their first meeting. He often intercepts her coming from Covent Garden on Regent Street. In the manga, William had told his father about Emma but his father had never seen Emma (different with the anime).
After Emma's departure, William changed drastically. He began to work very hard, attending social meetings and took care of his family's business. In his own perspectives, he never stopped regretting losing Emma, but he would live his life in the 'upper class side' as his father expected him to be. His change affected everyone around him, including Hakim.
Under the order of Dorothea Molders, Emma is to accompany "Mrs Trollope"(who is actually William's mother) as her lady maid to the engagement party(the one with Eleanor Campbell). William accidentally met Emma there and then. And, because of this new hope, he is conflicted by his engagement to Eleanor but he soon ends the engagement.
Despite all the criticisms regarding his relationship with Emma, he married her.
William officially breaking off the engagement with Eleanor.