Loki has many children. With Angrboða, a Jötun, he is the father of Hel, a girl half dead and half alive on each side of her body, Fenrir, a large wolf, and the World Serpent, Jörmungandr. By his wife Sigyn, he is the father of a son by the name of Narfi (and/or Nari). He is also referred to as the father of Váli.
One child of his I have purposefully separated from the others. In Norse mythology, it is told that Asgard needed a wall to form as a barrier against other Realms. A man stepped up to the task by saying that he would build the wall in a given amount of time, but for the price of the goddess Freyja, the sun, and the moon. Loki was put up to the task of distracting the man's horse so that he would not be able to work and so the man would not get the reward he asked for. To do this, Loki turned into a mare, and distracted the horse successfully. However, he ended up mothering a horse child named Sleipnir, who has eight legs.
Loki, playing the dangerous trickery he was, ended up killing the god Baldr. He was brought to a cave and tied up for his crimes. The goddess Skaði was responsible for placing a snake above him. The snake would drip poison down onto Loki. However, his wife, Sigyn, held a bowl over him so that the snake's venom would not reach her husband. Still, the bowl would fill, so she would have to leave to pour out the venom, which would leave Loki to suffer as venom dripped onto him. The venom would cause Loki to writhe around, which was said to be the cause of earthquakes.
One thing is certain about Loki: He has a spectacular role in Marvel.
"Loki." Wikipedia. Wikimedia Foundation, n.d. Web. 17 Jan. 2017.