But of course, it's more impressive if the completely wrong ship is less high-entropy - that is, if you don't have to dip so low in the search ordering to find it.

The problem is that the pairings feel too reasonable higher up in the search ordering. For example, I considered Moaning Myrtle / ?, Hagrid / ?, and Trelawney / ? but couldn't find other high-search-order matches at fanfic-SL4. With students characters I found it especially difficult, as magical teenagers are just too plausibly randy + weird.