Arbitrary Travels comes in many different formats, but one of the good things about it is that all of the storylines are self-contained, meaning that there's no need to read multiple stories just to understand one (the only exception to this are sequels, in which case I'll be sure to link back to the initial story).
In fact, part of this website's purpose is to provide any necessary background information for the series, such as character descriptions and what the setting is about. Another benefit of having self contained storylines is that anyone can choose to focus on whichever stories or characters they personally prefer.
There are labels for each reoccurring character in the series, that allow you to view stories containing that character. These labels are found at the bottom of each post.
Hopefully all of this is useful. If you have any questions feel free to let me know. Thanks for reading!