Lettie has a long blond hair in a single fringe and brown eyes. Like Celia, her outfit is identical to the Dancer job. Her outfit is dark magenta and she wears pink earrings. She wields two ninja swords.
The Lucavi are carrying out a plot to orchestrate a war in Ivalice and thus possess people in high positions to do their bidding. Celia and Lettie assisted Marquis Elmdore in re-retrieving the Scorpio auracite, which was held by Marach Galthena at Riovanes Castle. It is presumed she also fought in The Horror of Riovanes against the Riovanes Castle guards. After Rapha, Marach's sister, who is Ramza's friend, took the stone, Lettie ambushes her and Ramza on the castle roof with Elmdore and Celia. Ramza defeats the trio, causing Elmdore to make a tactical retreat.
Celia, Lettie, and Elmdore set up base at Limberry Castle. Ramza believes his sister Alma to be at Limberry, so he heads to the castle. Lettie attacks him at the gate with Celia. Ramza defeats the assassins forcing them to flee inside. In the castle, they alert Elmdore of Ramza's arrival. Before Elmdore can react, Ramza steps in. Celia, Lettie, and Elmdore attack him with Celia and Lettie revealing their Ultima Demon forms, but are defeated and killed.
Lettie is fought three times: once at Riovanes Castle, and twice at Limberry Castle. She starts at level 28 with 65 Bravery and 70 Faith, and comes equipped with two Spellbinders, Power Garb, Black Cowl, and Barette. She has access to the Subdual Arts command, as well as the Move +1 ability, a random action ability, and random Squire abilities. In this battle, she is immune to Chicken, Toad, and Stone.
In the first battle at Limberry, she is level 37 and comes equipped with the same equipment as before, but instead of the Black Cowl has the Golden Hairpin. She may either have a random action ability or none at all. In the final battle, she is level 38 and has access to the Throw command, but otherwise remains the same.
When fought in the fourteenth Rendezvous battle: Brave Story, she is level 99 and starts with 65 Bravery and 70 Faith. She is equipped with the same equipment as before, except with a Thief's Cap, and has access to the abilities Subdual Arts, Vampire, and three random abilities. She is immune to the same statuses as before.