To add a new category to a page you can click the Category button at the bottom of the page and type in the name you'd like your category to be called.
A full list of existing categories can be found at Special:Categories.
Pages in category "Browse"
“ This page is to categorize the Arcobaleno characters. Deletion of the page is forbidden.
“ This category lists stub articles on this wiki. A stub is a short article that can be expanded...