Norse
Loki
The Norse trickster, clever and mischievous, who is part of the gods' story but never quite one of the gang.
Loki is a trickster in Norse myth, known for being clever, sly and a shape-changer. In the old stories his tricks sometimes solve the gods' problems and sometimes cause them, and he travels with Thor in several tales: he once cut off the hair of Thor's wife Sif as a joke, then had to get it replaced with gold. He is Odin's sworn blood-brother, not Thor's brother.
The tellings differ and the oldest sources are medieval Icelandic poems and prose, so he is best described as complicated rather than simply good or bad. He is not worshipped in the way gods like Thor are, but he is a much-loved character in the stories.