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This article contains plot details from the latest books.
Lady Gisela is described as very beautiful, with pale peach skin and blonde hair. She has a red wound on her shoulder from when Keefe hit her with a Goblin throwing star after she attacked Sophie, Keefe, and Silveny in Exile.
Her name, Gisela, is a form of the name Giselle. This name means "hostage" or "pledge". This could refer to the fact that she pledged her allegiance to the Neverseen. It could also refer to how she became a hostage to them.
She is cold, acting with little to no emotion. She does care about her son (albeit in a cruel manner) which is shown when she wants him to complete his legacy. She also does not meddle with Keefe's genetics, which gives substantial evidence that he is not created to be Sophie's nemesis. Gisela is ruthless but also ambitious, doing what she needs to do to complete her goals.
It is revealed that Lady Gisela is part of the secret ( and evil ) organization called the Neverseen. At first Keefe believed his father was part of this group. Later, he realized it was his mother when the Black Swan and the Neverseen fought on Mount Everest.
It is unknown exactly what happened to Lady Gisela after Everblaze, but it was assumed she was tortured and maybe killed by the Ogres. During Neverseen, Keefe regains a memory that Lady Gisela erased about her
involvement with a secret plan called the Lodestar Initiative.