LOL it's modthesims. They have pretty much everything you need for modding the Sims. Well that sounded stupid didn't it
That said, some of the (human) Advent Children skins are really really good. There's a pretty nice Cloud, Reno and Rude, although some of them require other outside third-party meshes and skins to really bring them out from sameyness. Plenty of Tifas (although none of them are really that great for some reason) and quite a few Aeriths. Cloud's shoulder pads thing is a little shoddy but it's really just a limitation of the actual model mesh rather than any fault of the creators.
And for god's sake guys, it's just a furry. Old news.