I used to use “Subject (Topic)” format for tiddlers, and “Group: Subject” for tags. I borrowed the formatting from either wikipedia or fandom, I don’t remember which…
to note, I also navigate by tags, so keeping it this way allows me to quickly find what I need by clicking on tags related the the tiddler I’m looking for.
For instance, if I had a character from a book, and that same character from a movie, they would be titled John Doe (John’s Movie) and John Doe (John Doe Book 1), and would be tagged “Type: Character” or something like that.
I also experimented with using a system similar to discord (Topic #123) in the past but eh… wasn’t very appealing to me long term.
At the moment though, I’ve been using sentence structure, ie “John Doe from John Doe’s Book Series” or “John Doe during Book 2”
as far as journals or notes, I usually follow a “yyyy-0mm-0dd 0hh:0mm topic” format.
My unsorted tiddlers just use the unusedtitle macro to title “unsorted tiddler #n” with it modified to start at the number 1. (I wasn’t a fan of it starting at 0, but that’s just personal preference.)
system tiddlers (modified or custom) I follow the formats in place by the core, as to not change anything and make it easy enough for others to navigate if they ever had to.
I found using slahes and dashes as delimiters to be a bit cumbersome for large scale groups, and not very visually appealing to me, so I save them for system tiddlers.