If you want to use sword and katana, the best game for you is conquer.
The looking of sword and katana is very cool, and it has normal, refined, unique, elite and super quality. Different quality has differnt effect. Katana is the main weapon of ninja class and any classes can wear sword if you reach the requirement.
If you wanna have a try, you can download the game at this page
http://co.91.com/downloads/client.shtml
Have fun
