Loki

Trickster God and the true King of the Jotunn.
Loki was raised alongside Odin causing the two to become sworn brothers. He is the father of the world serpent, the queen of Hel, and the great wolf. He earned his title due to his ability to shapeshift into anything he could think of.
While many believed Loki to be a full-blooded Aesir the truth is that he is in fact the direct descendant of the creator of the Jotunn, Ymir, and the man behind the war of Ragnorok. After regaining his blood right as the king of the Jotunn Loki vowed to wipe out the Aesir, Vanir, and all their allies for their injustices towards the people of his grandfather.