The theme of self - discovery is also present. As they interact with each other, they learn more about themselves. In some fanfictions, Sera discovers her hidden powers while being with Nyktos, and Nyktos learns about his own emotions and vulnerabilities.
Sure. In fanfiction, the idea of Alucard as Sera's master has the potential for a great deal of creativity. It could mean that Alucard has a responsibility for Sera's growth and protection. This relationship might be set in a particular fictional world with its own rules and cultures, which would further shape the story around them.
I'm not entirely sure specifically about a 'sera yaoi visual novel' as it could be a relatively unknown or niche title. It might be a visual novel that features yaoi themes. Yaoi typically involves romantic or sexual relationships between male characters.
One reason could be poor writing. If the grammar is all over the place and the sentences are hard to follow, it makes the reading experience really bad. Also, if the characters are not well - developed and seem flat, it can ruin the whole story.
I'm not sure about the exact plot as I haven't read it in detail. But generally, it might involve the adventures of Sera in a world related to the Royal Stars.
I'm not aware of any specifically named'sera yaoi visual novel' being extremely popular. There are many yaoi - themed visual novels in general, but not one that I know of with this exact name in the mainstream.
Well, it could be the plot. Maybe it's full of holes and doesn't make any sense. For example, the story might jump from one event to another without proper transition.