Diana Ruíz, otherwise known as Diana, Ana, or Ana-chan, is the Head Scribe of Askr. Initially from another world, she was summoned as a scribe some time ago to help transcribe stories to entertain the nobles of Askr, including the ever popular Fire Emblem Fairy Tales and The Vampire's Servant series.

Eventually promoted to Head Scribe after the success of the fairy tale The Girl Covered in Ash, Diana's job includes writing new stories, writing transcripts of support conversations, and maintaining the Askran library. However, her job description did not include preventing drunk Heroes from hugging and kissing inanimate objects, and despite her protests and rants, knows that she is compensated well for her work, and is allowed full access to the library whenever she is on break.

Diana seems to be from the same world as Kiran. They have never met each other before, but they get along well, viewing each other as best friends. Diana also gets along well with Sharena and Lucina, as well as Camilla, Ike, Roy, Chrom, both Robins, and both Kirans. However, if she is in the same room as Narcian or Tharja, there tends to be a fight within a minute.

Diana enjoys listening to the Evillious Chronicles and the Happiness series when it comes to music, and watches something known as "Voltron" on several occasions. It is unknown how she has access to these devices.

Despite being from Kiran's world, Diana cannot summon Heroes, and Veronica has no idea that she is Askr. Diana has no idea if this is a good or bad thing.

When asked to write a biography of herself in third person, Diana proceeded to throw a book at Alfonse and ask why she had to do so. She still had to write this though.