1. No news on what ninjas will be introduced next for the global server (US, UK, HK) as only Oasis know when they plan on releasing them. People have be predicting when we get game content by comparing with the German server as we follow them closely. So once they get content, it's safe to say it would be released on our server at a given time (2 weeks to 2 months depending on what the content is).

2. They come in waves then later a ninja(s) per month if Oasis follows the same format as the China server (original server).

3. No particular order but overall it has been ninjas you get in plot instances, sage treasure, kage treasure, and edo treasure so far and they go back and forth.

4.1. Really depends if Oasis makes a few modifications as they have in the past i.e. Tobirama