It is perfectly fine to say what you think. 😉
However ... RMTV was written with Windows, macOS and Linux in mind.
The default "special characters" are mostly derived from what the filesystems mention in their documentation as illegal or reserved characters.
Just to illustrate this for Windows for example: Microsoft Documentation
Additionally, these reserved or illegal characters may be different for different file systems, and for network shares.
In the end, you can clear this entire list, and use the characters that are used in the original show and episode names.
However, this may give unexpected results.
You could of course make an "escape" list, for example replace "\" with "\\", "/" with "\/" etc.
Still not guarantee that everything will work 100% reliable of course.
I'm open to perfecting this list of course.
Note that these special characters may break data being passed to commandline functions as well.
$ echo "test"
$ echo "test"test"