I've seen some things be added to the wikia that have nothing to do with the series (such as the soramimi cake lyrics which is an Azumanga Daioh song) and just wanted to know if you were aware seeing as you seem to be the only admin who has been active in recent years.
I am wondering if you might happen to know whether this bubble bath artwork is canon artwork associated with the series (featuring Fine and Pyupyu & Kyukyu and Pumo and Rein together) or if it is non-canon. I found it uploaded to a site on 10 December 2008 so I know it's creation is from before then, but the artist and source and creation date are not listed, and the uploader has not been active since April 2013 so I do not know if they will be able to reply to the question or remember where they located it. I have tried reverse image searching it to see if there is some indication, but no luck so far.
I think it is a fanwork, to be honest :) I've been following the series since 2009 and since then, I came across many creative artworks as well.. Unluckily though, the last time I re-watched the series was at the start of last year. I'm still planning to arrange time for me to develop this wiki as well =)