Hah, thank you very very much, I'm glad you enjoyed it!
Yes, character artwork will be updated over time, usually aiming for one a month, so version 5's gonna get Arthur, and version 6's gonna get someone else. As for Konrad, he's not planned to be one of the 6 main cast characters, so probably not going to be a romance option as they are. But there might be some smaller scenes here and there dedicated to the side characters.