Shipgirls. You can’t swing a loli catgirl without hitting a dozen of them. Fortunately they’re easy to classify, as the Pixiv tag まったく、 駆逐艦は最高だぜ!! (“truly, destroyers are the best!!”) makes clear. This also crosses over quite a bit with 下着艦娘 (“shipgirls in underwear”), so most of them are in the NSFW section.
As a genre, I think it’s past its peak, but I just can’t see the new isekai wave generating as much quality cheesecake. Some of the early ones have done okay with the standard fantasy tropes, but now they’re into slimes, giant spiders, and vending machines.
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Sometimes you have to double-click to enter text in the form (interaction between Isso and Bootstrap?). Tab is more reliable.