There's not a whole lot that can be said about Fatima. She keeps details about her private life... very private. She grew up in the town of Tortan in the Ain Desert, where she fell in love with the magician Kasimir at a young age. The two married when they were only 18 and 17 years old, respectively.
The townsfolk of Tortan were not too happy with her hobby - summoning monsters from the void - so they kindly asked her to leave. Along with her husband Kasimir she traveled to the remote island of North Cerpo where she is able to practice her profession to her heart's content.
There's no doubt about it - Fatima is one of the most useful characters you can recruit for your castle. She is able to summon monsters from pretty much any dungeon you have previously visited, giving you access to easy grinding possibilities without even having to leave the castle.