Ragnarok ended centuries ago. But the battles between the gods and certain individuals go on. Loki's children are front and center in those battles. This is one of their stories. More
If you were chained down with unbreakable chains and rarely fed, never pitied, never spoken to, what would you feel? If your sister was bound to a world of ice and the dead with only sorrow and hunger as pastimes, what would you think? If your brother was thrown into the sea to die, what would your reaction be? If your father was spoken of in sneers when he’d sacrificed himself to save others by eating the blackest of hearts, then treated like a criminal because that darkness slowly began to take him over, what would you do? You'd rebel.
Ragnarok ended centuries ago. But the repercussions of it are still felt by Loki's brood. Banished to Midgard in human form, they were set to guard humanity as a punishment for their actions against the gods.
In the modern world, they are very different than the stories of old cast them.