User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-104.7.80.176-20150604192505/@comment-16281343-20150604193419

Her name is Elaine Westcott.
 * Her ancestor is one of the founding fathers of Hermetic Order of the Golden Dawn. Same organization Sirzech's Bishop founded.
 * She is a maid of the House of Pendragon and is the immediate aide of Le Fay.
 * She and Arthur are mutually in love with each other.
 * Arthur is the next head of the house and she is just a maid. Of course, Arthur's father is against their relationship like the usual cliche between two people of different classes.
 * Arthur left to protect Elaine so she can stay as a maid of the house.
 * That's one of the reasons why Arthur left. Another is because he's a battle maniac and wants to fight strong people.
 * Even though that's the case, there are no bad blood between Arthur and the house. Their father even sent Elaine to check their living conditions.
 * Vali acknowledges Elaine's capability.
 * Elaine hates Vali.
 * Vali gave Fenrir a new name: John.

Those are the things I remember at the top of my head.