The Tsurugi of Muramasa should allow Samurai to use additional “techniques” besides just bisection, with more becoming available with greater two-handed sword skill.

Samurai who twoweapon a katana and wakizashi should get some small bonus to damage or alignment record or similar. Though since they start the game able to do this, it would have to be a small bonus.

Being satiated abuses wisdom for Samurai (at the same rate it does for Monks currently), and gives Monks slow alignment penalties instead of abusing wisdom.

Samurai can wield katanas, wakizashis, and sabers in zero turns.

Samurai can’t use Excalibur, because it’s cross-culture. The Tsurugi should be buffed to be quite good enough.

Samurai have an ability (maybe a special ability) to displace hostiles.