Fandom was exactly what I was thinking of. Just maybe without having more ads than content. That I'm not a fan of, especially for volunteer supplied content.

Extra thought on search: add a weighting option so individual servers can be searched, but don't come up as high in the rankings. So keeping with the superhero theme, have the Flash comic wiki with a 1 weighting and the more general DC comic and Arrowverse wikis with 0.8 weightings.