User blog comment:Wikikinetic/I'm starting a wiki!/@comment-32354545-20170830050301/@comment-32354545-20170830052133

It's generally a good idea to use another wiki if it already exists - but being that the other wiki is only 5 days old and has zero edits and has a poorer URL than what can be had, you would probably have to go through the arduous process of adoption to get administrator rights on it... and I wouldn't bother with that.

What I would do is: go ahead and create your wiki at superphantomcat.wikia.com, and then send the founder of the other wiki an invitation. It's great to have other editors, and your best bet is to appeal to someone who has expressed an (even fleeting) interest in your subject.