WikiImp
A WikiImp is a troper that likes to tag pages with categories and templates. They do this to bring attention to the rest of the WikiFauna what needs help, and they generally leave most of the real editing to others.
They are not evil by nature, and are often helpful, but are often considered annoying by other WikiFauna due to their tendency to point out what needs help without doing much to actually fix it - but when it comes to fixing category tags and highlighting what needs worked on, their services are highly valued.