Sif

Sif is a character from the Marvel Cinematic Universe. She appears in Thor, Thor: The Dark World, Thor: Ragnarok and Avengers: Infinity War. She is portrayed by Jaimie Alexander.

Avengers: Infinity War
Sif appears when Thor and Bruce Banner go back to Earth. She is also seen when Thanos attacks Asgard to get the Space Stone and Soul Stone.

Allies

 * Thor
 * Odin
 * Heimdall
 * Volstagg
 * Fandral
 * Hogun
 * Bruce Banner/Hulk

Enemies

 * Loki
 * Thanos