Agnes Wickfield is an angel. We know it because David tells us so, like, a million times. But she also shows it through her appearance and behavior. We first encounter Agnes when David moves to Canterbury to go to Doctor Strong's school. David winds up living with Miss Betsey's business partner, Mr. Wickfield.
Anyway, so Agnes is basically too good to be true. She is completely self-sacrificing. Her father, Mr. Wickfield, lost his wife when Agnes was a baby. He relies on Agnes completely. And Agnes, far from resenting her father's obsession with her