Valkyrie
Abilities: As an Asgardian, Brunnhilde has superhuman strength, durability, speed, reflexes, agility, and stamina. She's also a highly trained member of Asgard's elite force of Valkyries, making her a renowned warrior. (Even Thor says he wanted to be a Valkyrie while growing up.)
Power scale: 5. Not only did Valkyrie survive on the bloodthirsty planet Sakaar for many years, she thrived. As a scavenger, she had to subdue and capture powerful warriors — including Hulk. She also overpowered Loki fairly easily. And she was drunk the whole time! Later, Valkyrie was essential in defeating Hela in "Thor: Ragnarok" and very helpful against Thanos' army in "Endgame."