Answer:
Slang for the male half in a marriage.
Old people and owls are said to be this.
Four kings of whom I am one lord. Often on deck but never on board. Though I have a large heart, I am always seen at war. During which I always wear a suit, but never a suit of armor. Who or what am I?
What goes up but never goes down?
They come in many varieties: Red, Black, Dead, and Caspian to name a few.
Cycle Cycle Cycle.