Hello Antonio
The idea of character styles is to make them more prominent in a paragraph for LO users to notice the words and what they are for. I am not sure what you mean with your message, but I find the present character styles OK and understand what they are for.
The Code character style matches the Code paragraph style. That is the reason for using 10pt. This allows for more characters to fit on one line in the paragraph style to help prevent long lines of code of line breaking.
The Keystroke character style uses the Liberation Mono font so it stands out for keyboard shortcuts.
Character styles are only used in the body of the text. Also, they are not used in titles or headings and will not appear in the Table of Contents.
Regards
Peter Schofield
psauthor@gmail.com
Technical Writer, LO Documentation Team