Ninjas are always crazy, i would use them in battle to go to the other side of the map, kill one of the enemies before they begin moving with two swords, stay there for a turn and counter and kill the other enemies who try to come after him/her, then move back to the other side where my troops are, and I've already taken out half their group while both sides are relatively far apart.
knocking someone off a roof to fall to their death with a stone is always fun.
Edit by Psychotic: Hey Bolivar, please don't double post. Use the edit/delete button instead. Thanks!