Wikipedia, when browsed via the Wii's Internet Channel, has a nice large font view. I'd like to be able to browse Gaming.SE from a Wii in a similar fashion, too. Currently I can't even search questions or tags since the Wii uses a virtual keyboard on input fields such that search on type won't work and there is no ENTER key...
The Wii (and it's browser) are well abandoned by now, but even if it were still supported by Nintendo, Stack Exchange is another matter:
Which browsers are supported?
We support the last two stable versions of the browsers that we see the vast majority of our visitors actually use. This does not include beta, developer, nightly, canary, or any other pre-release versions of browsers, which are not supported.
- Which browsers are officially supported, and what else do I need?
Please also see Stack Exchange's visualisation of supported browsers.
Note for read-only access, you might have some luck with services like FrogFind, which is a search engine built for vintage PCs and browsers, however in my testing it only worked for certain pages (and even then, didn't provide all the content on the page).