Books similar to fourth wings concept (no y/n type character/less sexual/no sexual romance)

I really like the concept of fourth wing (dragons, military academy, etc.) but didn't really like the y/n type character (so petite and curvy) and an mc with character depth please. Also little to no sexual activity in the book (like its not part of the main appeal to the story if it's there it's there type thing). Thx