You can't yet.
ski lodge
in the ski logde
you have to be a member on club penguin to be invisible you have to pay if you have to be a member?
There is nothing known as a shadow ninja on club penguin. Never was, isn't, and never will be. Hear it people, the black gem in the middle on all elements is normal card jitsu not card jitsu shadow!
you should become a fire ninja
You become a ninja.
You can't yet.
Go in the ninja hideout, and buy it from the ninja catalog.
1
you cant become sensei but you can be a ninja
Wait there might be in 2012 snow ninja
No, not really. You can become a master ninja on club penguin, but not a Sensei.