Here is a pair of black/white Katanas which have a medium size blade and copper ends, plus a black sheath. Both swords can be crafted to be used as a normal sword or an off hand sword (held upside down like a Ninja or something).
Stats are similar to Ebony sword. Requires steel smithing to craft/improve and same materials as steel a sword. Obtain by crafting or finding them in the basement of Dragonsreach. Weapon IDs are "katanamr", "katanamroffhand", "katanamrwhite" and "katanamroffhandwhite". No DLC required.