Amy Barksdale

Amy Barksdale is the youngest sister of Helen Morgendorffer and has often appeared in Daria fanfic as a support giver for Daria Morgendorffer. Her role and appearances in various fanfics are many times greater than her appearances in the series (three total).

Saint Amy
In the TV series, Amy Barksdale had a special relationship with Daria, offering her advice and moral support because in certain ways she appeared to be a grown-up version of Daria herself (see "I Don't" and "Through a Lens Darkly"). This element is taken to the extreme in some fanfic, leading to the archetype often called "Saint Amy," in which Amy rides in like the cavalry to rescue Daria from bad situations.