Thread:Greasiggy the Koopa/@comment-3495717-20160705203750

From the site rules
 * Images that are intended for personal use (areas of the wiki that are not part of the mainspace) must have the uploader's username as part of the filename, otherwise they will be deleted.
 * Alternatively, upload your images to a supported image-hosting website and paste the direct link onto the page where you want to use the image; it will automatically embed itself, though you will need to use the ImageHandler template if you want to resize it.

There was an announcement regarding this just over a month ago.

Basically, if you must upload images here to be used anywhere but the mainspace, your username has to be part of the filename. 