Vali

Norse Mythology: In some sources, the twin brother of Vidar. In other sources, he is the youngest of Odin's sons. His mother is the giantess Rind and he was born for the express purpose of avenging Balder's death since the gods could not kill one of their own. When he was only one night old, he killed Hod. He will be one of the seven Aesir to survive the ragnarok.

(Nicole Cherry, A list of Norse Beings, http://www.ugcs.caltech.edu/~cherryne)