If the products are different, you don't necessarily need to make every description completely unique. I also have a website where I host different comic series. They are all different, but they are still essentially the same type of product.
What I do is make each individual page useful by adding details such as the author, genre, release date, and other specifications. You can do something similar with your product pages by adding unique specifications and useful information for each product instead of trying to rewrite the same description every time.