Thread:Ripto22475/@comment-27942689-20170602202211/@comment--20170606225739

Hey, I am not aware if there is a function for staff or not to delete all categories in a click of a button. That would be something to ask them at Special:Contact/general.

However, deleting all categories is a rather easy task to complete if you have a list of all the categories in text.

Such as...
 * Category:Characters
 * Category:Males
 * Category:Females

Written in that fashion. If you can collect all of them (and Special:Forum may be of help if someone has a technique to grab all categories on a wiki) you can then use AjaxBatchDelete to delete all of them.

Hope that helps! That is a method I know of. Special:Forum on here has people who know more than I do with this stuff so I recommend shooting a message onto there when you can!