As much as individual roaches disgust me, whenever I encounter one in an unexpected way?
I have always admired how well adapted they are.
A number of years back, I read most of a book which chronicled several species' success, that have "hooked a ride" on the "human train of existence".
The lowly potato, which prior to humans domesticating this plucky plant, was rather uncommon. But by happenstance, this thing's "storage shelter for the winter" happens to contain nearly a complete balanced nutrient mix, for humans (if you eat the skin-- important trace elements in there).
The marijuana plant is another. Again, seemingly by happy accident, it has two things going for it-- a very fibrous stem, which is quite useful to humans for making textiles, and one of it's principle chemicals is so similar to a behavioral hormone humans produce in their own brains, that it can substitute for that same chemical. It has been a quite successful partnership, just going by the numbers.
The dog, and that's pretty obvious.
And finally? The cockroach--which has evolved a wee bit, to really thrive among human garbage. Just going by the total numbers, it's been estimated there are at least several hundred roaches per person on earth. At least. Roaches do not seem to be bothered by human destruction of other species' habitat, having moved right into our cities and towns, literally right under our feet. Only Rattus Rattus, is doing as well among humans, but only coming in a distant second place.
There were several more, but those were the most fascinating to me, and thus, the ones I remember best.