A Soft Baddie is a person who falls under a softie aesthetic, but occasionally wears outfits with a more mature, sexy, or gothic vibe, or as a whole is a softie with a focus on more mature looks and clothing, but still with the pastel colors.
Poolcore is an aesthetic which consists of images of pools which give off an eerie or peaceful feeling or vibe. Often, these images are simply photographs of real pools, or pool water, but they are also frequently 3d renders or art. Poolcore was born from the internet and similar aesthetics, such as liminal spaces, so the images are often familiar, or seem as if you've seen them before.