Kaze_no_hogosha from the Message Boards has started work on a doujinshi which will follow the storyline of Seiken Densetsu 3. The first six chapters are going to feature the back story behind each character, and after that the story will focus more on Duran as the main character.
So far there are three pages done and it is looking nice! We don’t have a fan stuff section ready on Seikens yet, but we’re working on it. Until then you can find Kaze’s doujin on the Message Boards.