To further add, I do love how each of the guardian costumes/classes seem to correspond with each of the six pony races, with the most obvious being the Hunter armors looking like they are inspired by Pegasus wings.
 
Also, almost all of their armors seem to closely resemble costumes from the show and from the Equestria Girls franchise.
 
Also love that their pets are the Ghosts. I noticed that you even included the eye shapes for each of them. That’s a neat touch.
 
While Luna here is the Traveler, it would be nice if she had something representing her pet possum, Tiberius, from the comic book series.
 
I wonder who would be the Darkness. It could be Discord, or it could be based on the idea of the Lauren Faust’s old idea of the corruption force that twisted Luna’s desires and grief into Nightmare Moon.  
(And maybe had something to do with Discord, I’m not sure. You can ignore this one for now)
 
I would love to be the one to give them helmets to suit them. Alas, if only my art abilities were good enough. Maybe one day.

This looks pretty cool.
 
Did you plan on giving them masks as well?

absurd res tag???

Now we have three more subclasses!
 
I vote Sunset Shimmer for the new Warlock!

So Luna is the Traveler