Parrying, Resist, and Med/Focus are all redundant.
If you're intending to use Mirror Image then 4/6 casting is advisable. If you're 4/6 casting then Chivalry and/or Spellweaving is advisable. If you intend to use a shield for 1 FC then you can't use Parrying unless you lose the Bushido.
Bandages are a good option on Ninjas.
What is your intention with using Bushido?
What is your intention with using Ninjitsu?