Thread:The S/@comment-995426-20170618002134/@comment-995426-20170627042639

Look at the edit I just made to Template:Turtle character infobox. The includeonly portions of the template allow the option of adding certain categories to articles, such as Category:Male Characters. But the template itself was not categorized until now, so I added Category:Templates within its noinclude tags.

Note that if you add a category to a template outside both includeonly and noinclude tags, it will categorize both template and articles the template is embedded in. That was the mistake you made earlier with Template:Citation that caused it to add every article it was embedded in to Category:Templates until I made the change.