What are the E Minor triads?

It really depends on which form of minor you are talking about. What you have written above is a mix of natural minor and harmonic minor. Also, G would be the relative Major of e minor. If you are writing this piece using natural minor only, the V would be a minor v and the vii would be a major VII. If this were harmonic minor, the III would be an augmented III+ and everything else is fine. What you have written should be okay because minor is minor; so you really don't have to worry which from of minor you use, because there is no such thing as, "This piece is written in e harmonic minor." It would just be e minor. Do you understand? Hopefully, you do and this works for you somewhat. If you need additional help, just ask your teacher!