Regardless in which element they appear (Wands, Cups, Swords, Pentacles),
Knights represent AIR.
knight of wands
The Knight of Wands is an air knight in a fire element. He represents those who often act without thinking. This knight is impulsive, passionate, protective. He is blindly loyal to himself & others. He moves quickly, & is not a stable presence.
knight of cups
The Knight of Cups is an air knight in a water element. He loves to think about how he feels. He romanticizes & day dreams. He lingers so long in his reveries that he becomes hesitant to move beyond his feelings into reality.
knight of swords
The Knight of Swords is an air knight in an air element. He is a quick thinker, but often jumps to conclusions. He rarely consults or considers anyone else before making decisions. Sometimes he moves so fast that he puts events into motion that cannot be undone.
knight of pentacles
The Knight of Pentacles is an air knight in an earth element. This dude thinks about situations so long, & moves so slowly to turn his thoughts into reality that it might seem to others as if he's moving backwards. However when he finally moves, he executes a plan that is solid, steady & fail proof. He has foreseen every eventuality & is prepared for anything.