Eva Doujin novels had many popular types that could be referred to as follows: 1. Combat: Battles and conflicts between Eva and other characters are common topics in Eva Doujin novels. These novels often described the interactions between the Eva and other characters 'skills, strengths, and strategies. 2. Romance: Although Eva itself has no gender, many Eva Doujin novels involve gender changes or romantic relationships between characters. These novels might emphasize the emotional exchange and interaction between the Eva and other characters. 3. Sci-fi:Eva is a sci-fi work. Some doujin novels may associate Eva with other sci-fi characters or technological elements. These novels might explore the role and mission of the Eva in the future world. 4. Magic:Eva is also considered a magic work, so some Doujin novels may associate magical elements with Eva. These novels might describe magical battles and adventures between the Eva and other characters. These are just some of the more common types of Eva Doujin novels. Of course, there are many other types of Eva Doujin novels to choose from. I hope these recommendations will help!