Blackfrost

Blackfrost is the non-binary ship between Loki and Natasha Romanoff from the Marvel Cinematic Universe fandom.

Canon
Due to being enemies, Loki and Natasha have no scene involving them as good friends.

Loki and Natasha Romanoff are redeemed villains. Even though Loki had tried to conquer the worlds, he makes good attempts like saving the Asgardians from Hela and sacrifice himself for Thor. Meanwhile, Natasha broke out of her Red Room brainwashing thus struggle to redeem herself. Other than that, both are misunderstood villains. Loki decided to conquer Asgard and Earth just for being accepted by Asgardians especially Odin meanwhile Natasha was brainwashed into killing billions of innocent people throughout her Red Room training.

Loki and Natasha Romanoff have adoptive families. When Loki was born, Odin decided to take Loki as his adoptive son while Natasha treated the Avengers as her family. They also blonde hair siblings figures (Thor for Loki and Yelena for Natasha). They are intelligent people.

Fanon
The shipping began in one scene of The Avengers when Natasha asked Loki if he's mad when he was arrested. Fans believed if Natasha and Loki are canon, Loki would say to Natasha something that would make up for the Avengers then hook up with her.

Loki and Natasha's personalities clashed but fans think it mix well. Other than that, they believed that the ship work as both are reformed villains. Fans feel like if they were to get along, Natasha would accept Loki for who he is, having to hear about his hard background. She would be more understanding to him and be someone who would always have his back. It would start off as a friendship and grow into something even bigger with time.

Many fanworks involve Loki being punished after the events of The Avengers by being changed into a human, sometimes Natasha was his handler or teacher, or sometimes they just meet again. Other than that, some also involving Natasha being included in canon events where she was not present, like Thor: The Dark World or Thor: Ragnarok.

Fandom
FAN FICTION

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