I'm not familiar with a light novel specifically named 'BSD 15 Arc'. It could potentially have unique characters. Maybe it has a complex plot with multiple story arcs that interweave in interesting ways.
'Re:Zero − Starting Life in Another World' is also a well - known light novel. The main character has the ability to return by death, which leads to a lot of complex and emotional storylines as he tries to change the fate of himself and those around him in a fantasy world.
Most BSD light novels often have complex characters. Since they are based on literary figures, they bring in the depth and complexity of those original personas. For example, a character might have the same traits as a famous writer but with a unique twist for the BSD universe.
The appeal of all BSD novels lies in their ability to create immersive worlds. They draw readers in with their unique concepts and engaging storylines. For instance, the way they handle character relationships is very captivating. The conflicts and reconciliations between characters make for a great read.
Honestly, there's no definite answer on when the BSD manga will end. It all comes down to various factors like the author's inspiration, the popularity of the series, and the publisher's decisions.