Filters the list of characters voiced by a VA to show only the characters from anime in your completed and current watchlists.
When the script starts, it retrieves the username and completed anime watchlist of the currently logged in user.
When a page of a voice actor is loaded, it adds a button to the Character Voice Roles header.
Clicking the button causes it to scroll down the page repeatedly, in order to load all the characters, afterwards it scrolls up.
Then the character entries are removed of shows that are not in the watchlist or that are duplicate.
