Hela

Hela  is the goddess of death and the ruler of  Hel  .

The Avengers: Earth's Mightiest Heroes
Hela was the ruler of Niffleheim, the land of the dead. Captain America was transported into her realm and tried to convince him to stay. Hela was well aware of her father Loki's plans and played along with them, but knew her father very well, and was aware of eventual betrayal.

Hela negotiated with Captain America, and transported him to Asgard to aid his team, on the condition that should he fall in battle, his soul would belong to her.

At the Avengers Mansion, Cap saw a reflection of Hela on his broken shield just before he was ambushed by a Skrull imposter.