Valkyrie (Marvel Cinematic Universe)

"I've spent years, in a haze, trying to forget my past. Sakaar seemed like the best place to drink, and to forget, and to die. One day. {…} I don't plan to stop drinking. But... I don't wanna forget. I can't turn away anymore. So... if I'm gonna die, well... it might as well be driving my sword through the heart of that murderous hag."

- Brunnhilde to Thor.

Valkyrie is the tritagonist in Thor: Ragnarok and will be back in Avengers 4 as one of the main characters.

She is portrayed by Tessa Thompson.

Thor: Ragnarok (2017)
Valkyrie was once a loyal warrior to the gods of Asgard. One day, the wicked sorceress Hela attacked, and many of her fellow soldiers were killed. Valkyrie was eventually stranded on another planet, where she served the Grandmaster.

She first runs into Thor when he lands on her planet. Valkyrie tasers him and drafts him as a competitor against the Hulk.

Valkyrie eventually showed Thor her soft side when she revealed her haunted past and helped Thor and his allies fight and defeat Hela.

Avengers: Infinity War (2018)
Despite Valkyrie don't appear in the film the directors having revealed who Valkyrie and the survived half of the Asgardians are escaped from the Statesman with several escape pods during Thanos's attack and before escaping she haved call a help request to the Guardians of the Galaxy to save Thor, Hulk, Loki and Heimdall (despite only Thor being saved as Hulk being saved by Heimdall who sends him to Earth with the Bifrost, Heimdall bring killed by Thanos and Loki being apparently killed by Thanos despite it's more than probably who Loki is alive due to his powers, his healing factor and his ability in faking his death), it's also confirmed who Valkyrie and the survived half of the Asgardians are still after the events of the film because they was very far when Thanos deleted half of the life forms of the universe.

Avengers 4 (2019)
Valkyrie will back in Avengers 4 and Tessa Thompson will reprise her role.

Allies

 * Valkyries + - Closest friends and former teammates
 * Revengers - Teammates
 * Thor - Enemy turned Close Friend, Love Interest l, Savior, Rescuee and Teammate
 * Hulk - Close Friend, Savior and Teammate
 * Bruce Banner - Friend and Teammate
 * Loki - Enemy turned Friend, former rival and teammate
 * Asgardians
 * Heimdall +
 * Skurge + - Enemy turned Ally and Savior

Enemies

 * Hela + - Arch-Enemy, Indirect Victim and Attempted Killer
 * Grandmaster - Ally turned Enemy
 * Hela's zombie soldiers +
 * Fenrir +
 * Surtur + - Enemy and Attempted Killer

Trivia

 * Valkyrie is played by Tessa Thompson.
 * In the comics, Valkyrie is portrayed as blonde.
 * Valkyrie survived the attack on Thanos, as confirmed by the directors.