This page contains detailed information about Septa Eleanor as obtained and inferred through quests. It is organized by volume, and the quest(s) where the information was obtained is linked. If the quest was fealty-specific, that is noted as well.
Feel free to add new information as you find it!
If you have not played through all of the volumes, this post will contain spoilers.
She is the representative of the delegation of the Faith of the Seven that has come to your holdings. Septon Daryn is the head of said delegation. Holy Delegation
She offers herself as an instructor to your daughters, particularly Jayne, in household management; should you accept, she will begin tutoring Jayne. An Offer of Propriety
If you have the hedge knight background, she is menaced by an old friend of yours, and she hits him in the groin with a poker to escape. Overstayed Welcome
If you have the highborn bastard background, she is the one duped by the Strange-Eyed Man. A Definitive Account
She is bothered by a man's violence toward the Silent Sisters when his wife dies, and she asks if one can truly be forgiven for what they do while in the thrall of intense emotion - either by one's friends or oneself. She will not explain the reasons why this bothers her, but she thanks you for your counsel. The Seven See All
At some point in her life, Eleanor contracted a fever that left her cheeks pockmarked. Splashes of White
She believes a person's intentions matter when they do something to endanger the realm. Fevered Mercy
As Eleanor describes, the Seven do not make things happen; they merely light the way for you and grant you the opportunity to choose. Stark Irony
She is shocked by the relationship between Renly and Loras, fanning herself at the mere mention. Next in Line
She dislikes violence and struggles with even mentioning the acts out loud. Blood on the Altars
No new information is obtained.
Eleanor is from the Riverlands and had a noble upbringing. Red Letter Day
She seldom confides in Rona and never on personal matters. Red Letter Day
She was once betrothed to a knight named Ser Launcil Hallar, and he sent her a letter inviting her to his second wedding. His family broke the betrothal with her. Launcil's Invitation
Her faith was tested by her former beau's return, and she may have run away with him a few years ago. Eleanor's Return
She becomes flirtatious with you at the masquerade and wine festival, mentioning how desirable she was when she was younger. Enjoying the Occasion
If you decide to take Eleanor to bed, she will admit that she doesn't remember what you did together and laments that the Seven will never forgive her for violating her sacred vows. Another Side of Eleanor