So, more things about the OC for the next arc. The OC does have a weakness not just to eel, dragon root, or blue oleander. The OC is also weak to a plant called Dragon Vine and the parasite Glimora. The OC also has grandparents named (GM/N) and (GP/N). There will be a point in time when you'll go to Equestria with Twilight since you do get curious about her homeworld. When you do go there, you will have a pony form. This is what you'll look like.
I'm calling it Night Strike. The idea was to make it all black, but then when I think about it more, it would be a dumb idea. So I added in some purple to the mix to represent the strike class colors. I even added the strike class symbol on it as well.
Also, Dusk, from the OC Bio, is also like you. He can also transform into any dragon from the HTTYD Series. He is the alpha species, however, and controls all the dragons. Eventually, you will take the title of King of Dragons.
Update on the Harem
Shadowbolts
Left to Right: Sugarcoat, Sunny Flare, Sour Sweet, Lemon Zest, Indigo Zap
Gloriosa Daisy
Juniper Montage
Starlight Glimmer
Wallflower Blush
Miss Cheerilee
Fleur De Lis
Chestnut Magnifico
Photo Finish
Violet Blurr (left) and Pixel Pizzaz (right)
There will probably be more to add, but for now, this is what I have.
I would take suggestions for the Harem. So comment down any other female characters you'd want to see.