The constellation Cepheus the King is visible from the Northern Hemisphere every night of the year due to its close location to Polaris, the North Star.
Capricornus the Sea-goat is can be spotted in September and October, and is formed in the shape of an arrowhead. One Messier object, M30, is found within.
Corona Borealis, aka the Northern Crown, looks like the letter C. A dark sky is best for seeing this faint semicircle of stars. It's between Arcturus and Vega.