Morrowind had such weapons as Tantos, Wakizashis, Katans, Dai-Katanas, and Throwing Stars.
Oblivion had Katanas and Dai-Katanas, if a bit limited to Blades equipment, and Blades Armor.
Skyrim had Blades Armor and a Katana. They have one special/rare Dai-Katana that is not availablke until level 20.
What do you think about Japanese-themed weapons and armor and would you like more to be added in the next game? I'm not talking about replacing the European sets, but I am sure we can share both European and Japanese themed weapons and armor in the games.
Yumi Bows, Naginatas, Yari, etc should also be considered.