Odin, the Allfather, king of Asgard and the Æsir gods. He is as much a god of war, fury, and death as he is of wisdom, magic, and poetry. He rides his eight-legged horse Slepnir, of which there is no equal, and brandishes the spear Gungnir, which can never miss.
Loki, the trickster. Actually a born Jotun, he became a blood-brother of Odin and now counts himself among the Æsir. Responsible for the death of Frigg's son Baldr, father to many oddball children, and fated to bring Ragnarok.
Tyr, a god of war and glory who lost his hand helping to bind the wolf Fenrir. While considered a son or adoptive son of Odin, he may have once been the head of the Norse pantheon.
Thor needs no introduction, I'm sure.
Heimdallr, of nine mothers, who sits at the Bifrost and watches for Ragnarok's approach.
Baldr, the shining, the prized son of Odin and Frigg. Upon fearing that he will die, his mother makes everyone and everything in the universe promise not to harm him, including Loki. But it would be no use. The mistletoe, too young to make such promises, did not. And with that, Loki tricked the blind Höðr into fatally shooting Baldr with a mistletoe-laden arrow.
Njörðr, the lonely god of the sea and of summers, one of the Vanir gods.
Freyr, the son of Njörðr, is the god of kingship and fertility. He rules over the elves and rides atop a golden boar crafted by dwarfs.
Freyja, daughter of Njörðr, who is queen of the Valkyries, and a goddess of love, sex, gold, war, and death.
There are plenty more, I could go on all day.
I made compromise because people don't give as much of a shit, but I agree with you.
They are only as big as the Æsir and Vanir gods, typically, although there are exceptions where Jotnar grow to impossible sizes. This same thing occurs in Greek mythology with the Titans - they're no bigger than the Olympians but have the misconception of being large because people read that Cronus could eat his kids whole.