The best plugin for creating an author profile page for a multi-author WordPress website is the Co-Authors Plus plugin. This plugin allows you to assign multiple authors to a single post and create a co-author profile page for each author. It also allows you to set up custom author templates, so you can easily customize the author profile page to match your website's design. Additionally, you can use the plugin to display a list of posts by each author, as well as a list of authors on your website.