Ishtar is an enemy character from Fire Emblem: Genealogy of the Holy War. She is the daughter of Bloom and Hilda, as well as the sister of Ishtore. She is also the cousin of Arthur, Tine, Amid, and Linda, the niece of Tailtiu and Ethnia, a granddaughter of Reptor, and a distant relative to Victor, Arvis, Azelle, Julia, Saias, and Julius, with Julius being her lover.

Through her father, she is a descendant of Thrud who has inherited the ability to use the Mjölnir. From her mother's side, she is a descendant of Fjalar. As a result of her immense power, Ishtar is known as the Goddess of Thunder. During her childhood, Reinhardt was assigned to be Ishtar's personal guard. While he became the first in command under her to the Gelben Ritter, she became a very powerful mage who is widely known for her skill with thunder magic.

Despite her mother's cruel treatment of Tine/Linda, Ishtar did not treat her with disdain, and instead did her best to comfort her in her times of need.

Some time before the Liberation War, Ishtar and the Imperial Prince Julius of Grannvale fell in love with each other. Her mother was very pleased with this relationship, as she wished to benefit from their union. After Julius received the Book of Loptous, he murdered his mother and tried to kill his sister, but his love for Ishtar never changed. Despite knowing what happened to him, she remained loyal to him and continued to love him. However, once he began performing the child hunts, she became shocked and attempted to convince him to stop. After Julius ignored her protests, Ishtar began to work with Emperor Arvis to secretly free the captured children.

Soon afterwards, while she and Julius are in Conote, he comes down with a high fever. She becomes very worried about him and travels to Leonster Castle to ask Bishop Saias to cure Julius of his illness. Around this point in time, Julius begins to notice Reinhardt's romantic feelings for Ishtar, which makes him extremely jealous and furious. He orders Ishtar to remove Reinhardt from his status