Just as a word of warning for anyone considering creating a Smash Bros one, we are currently working on plans internally to create a Smash one as a NIWA project, seeing as Smash is really a crossover of many Nintendo franchises.
I would also like to suggest that those considering starting wikis do their best to affiliate and/or work with big independent sites in their fandoms. While not exactly a requirement as such, it would be preferable to see, for instance, something like Starmen.net sponsoring the Earthbound one, even if their staff aren't involved directly in the production.