Ymir
Ymir, a mighty Ice Giant, was one of the first creatures to be born of the Demiurge's influence on The Nine Realms. His home was the frigid wastes of Niffleheim.
Ymir was the progenitor of several races, including the Frost Giants, Vanir, and Aesir. He was slain by Odin when Ragnarok broke the cosmos, and his body was used to rebuild damaged parts of the Demiurge.