Thor: Ragnarok had introduced Thor’s unmentioned sister into the MCU. While it is true that Thor has a sister in the Marvel Comics universe, it is not the same sister that appears in Thor: Ragnarok.
In Thor: Ragnarok, Odin has revealed that his firstborn child was a girl named Hel, the goddess of death. Odin has been using his power to seal Hela away from the Nine Realms as her power had grown to be dangerous.
There is a similar but not the same origin for Thor’s sister in the comics, Aldrif Odinsdottir, aka Angela. Like MCU’s Hela, Angela was Odin’s firstborn. When Asgard had gone to war, the queen of the Angels who inhabit the tenth realm kidnapped Aldrif to make Odin surrender. When Odin had refused, the queen killed the child and Odin and cut Heven off from the World Tree and isolated it for generations.
The queen of Heven had ordered her handmaiden to dispose of Aldrif’s corpse, but the handmaiden had discovered that this child was alive. The handmaiden had raised the girl as an angel under the name, Angela and though Angela had excelled at combat and exemplified the values of the Angels, she was mocked for not possessing wings.
The events of Age of Ultron caused a ripple in space time that had pulled Angela away from Heven. She had encountered the Guardians of the Galaxy on her way to Earth and joined them for a short time.
Thor and Loki had returned Heven to the World Tree, which had led to a confrontation with Angela, who then proved more than up to the task of battling her brother Thor. Angela then came to terms with her brothers but her relationship with Asgard has been tense.
Angela has acted as an assassin for Asgard and has taken over control of Hel from Hela.
Thor: Ragnarok has an 84.52 ComicBook.com Composite score, the sixth highest composite score of any comic book movie.
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Thor: Ragnarok is now playing in theaters. Other upcoming Marvel Cinematic Universe movies include Black Panther on February 16, 2018, Avengers: Infinity War on May 4, 2018, Ant-Man and the Wasp on July 6, 2018, Captain Marvel on March 8, 2019, the fourth Avengers movie on May 3, 2019, the sequel to Spider-Man: Homecoming on July 5, 2019, and Guardians of the Galaxy Vol. 3 in 2020.