You can just look in the "Ninja" section where you upgrade your characters.

If you're talking about the unreleased ones there should be a google doc list of the untranslated ones somewhere around here. This post was last edited by Scarbucks Coffee at 2017-4-19 08:59

Here

https://docs.google.com/do*ent/d/1NugtF12K5S1lPNH1vkE2cp5mjV9kEvJDLdaWFY_V610/edit?usp=sharing

https://docs.google.com/do*ent/d/1vtTQck-DtuaRm6smqFhJ8ZjLqO7Mvd6Kr0QlNKXusRg/edit?usp=sharing
This post was last edited by Petrichor