I tend to create variants as I think of them, so I often make a bunch of redirects along with an article. Like if I make a fanarticle I'll usually redirect all the pseuds, if I make a pairing page I'll redirect both orders and any common smooshed names etc etc.
You can look at all redirects here:
http://fanlore.org/wiki/Special:Listredirects

AFAIK they don't show in categories, as it would be tedious to see a gazillion variants for every entry.

ETA: That redirect list is very inconvenient however since it's not sorted, or maybe chronologically by creation time? It's quite unordered in any case.