The wiki isn't supposed to have full-fledged articles for the tags. Just a brief description of the tag, what it's about and when (not) to use it. Link to wikipedia for further information on series or characters.
Posted under General
http://en.wikipedia.org/wiki/Wikipedia:Copyrights
"The Wikimedia Foundation does not own copyright on Wikipedia article texts and illustrations [...] Permission to reproduce content under the license and technical conditions applicable to Wikipedia has already been granted to everyone without request [...] Wikipedia content can be copied, modified, and redistributed so long as the new version grants the same freedoms to others and acknowledges the authors of the Wikipedia article used (a direct link back to the article satisfies our author credit requirement)."
Now I hate legal jargon, but that reads to me like we can copy what we like from wikipe articles as long as a link back is included.
It is pointless to duplicate wikipe content however, when a short summary and a link to wikipe or other sources does what we need (which is explain the usage or tags and terms etc.)
It a pointless argument of course since all the image content here is used without permission and often without attribution.