Loki
Loki is a trickster God. He is usually making trouble with the rest of the Gods, but most of the time fixing it afterwards. He is the wife is Sigyn, though no children were produced. He instead had four children elsewhere; Hel, Fenrir and Jormangandr by Angrbodr , a Jotun who resides in the Ironwood on Midgard; and Sleipnir, the eight legged horse through a union with another horse when he poses as a mare to help the Aesir finish their new wall following the Aesir-Vanir war.
He finally went too far however when he tricked Hod, the blind God into killing Baldr with a poisoned dart; the son of Odin and Frigg, who was then sent to Nifelheim until Ragnarok. There was no fixing that one. He was sentenced to life chained to a rock in a cave, and to have venom from a snake constantly dripped upon him; venom which his wife Sigyn catches in a bowl to stop his suffering; which she pays for at Ragnarok when Loki breaks free, and the snake bites Sigyn.
During Ragnarok he falls to Heimdall's blade.
Loki is unique in the fact that he is the only being, outside of the outside of the Aesir and Vanir Gods whoin recent years (in God terms of time) who has attained an attunement to a rune.