Yes, as the title implies, there
is an Ace Attorney Wiki out there. No, it is not a part of NIWA, but it would sure be great to see it become a member.
In short, the
Ace Attorney series is a (relatively) Nintendo-exclusive series, although some of the games have been ported to the iPod as a playable game. The games in the series make for a captivating experience, it would add a lot to NIWA to have such a series covered by one of their members.
There is a wiki that is devoted to the series. It is an independent wiki, the site being hosted on a former Super Mario Wiki staff member's (Paper Jorge) site and led by the well-respected MarioWiki community member Turboo.
Although the series deserves its own wiki, the Ace Attorney Wiki is a bit lacking in activity; and as a result, content. I implore you to join the site and help out a bit: the
Ace Attorney series deserves better coverage. By helping out the wiki, you'd also be helping the site come closer to being able to join NIWA. If the site joins NIWA, you'll be helping the organization grow. You'd be doing a great help by fixing that one typo you see, or making that rewrite that you feel needs to be done. Every positive contribution makes a difference!