Loki

Loki is a trickster god and an enemy of Magnus Chase. He is the father of Hel (the fearsome ruler of Helheim), Jormungand (the world serpent), Fenrir (the ferocious wolf) and Samirah Al Abbas.

Appearance
In The Sword of Summer, Loki has dirty blonde hair (with red, blonde, and yellow tints), and is seen wearing a Red Sox jersey, jeans, and white tennis shoes. Loki is considered to be handsome, but also has large scars on the bridge of his nose and cheekbones, along with welts around his mouth.

Personality
Loki is sly, manipulative, charming, humorous, mischievous, quick to anger, and cruel when he needs to be (demonstrated when he burned Randolph Chase's face as punishment for failing him). Rick Riordan says he wrote Loki as he was in the myths: "[...] clever, funny, capricious, silver-tongued and quick to anger,".

Despite his negative traits, Loki does harbor affection for his children, especially Samirah al-Abbas, Vali, and Narfi. When speaking to Magnus on Naglfar, Loki is visibly upset and grieved about the fate that his sons Vali and Narfi suffered as part of Loki's punishment for killing Baldr.

Abilities

 * Illusions: Loki can cast illusions of himself anywhere he pleases.
 * Shapeshifting: Loki is able to change various forms including, but not limited to, a salmon, a mare (in this form he even gave birth to the colt Sleipnir), a seal, a fly, and an elderly woman called Thokk.

Trivia

 * A joke was made in The Sword of Summer about Loki's name being similar to the English phrase "low-key."
 * During Ragnarök, Loki is destine to kill Heimdall, but also to be killed by the latter.