I'm making sims based on 4 elemental characters I made a long while back, 4 sisters. So basically I need:
For the air element: Bird legs and wing arms
For fire: Dragon wings, and claw hands
For water: Mermaid tail, and fin ears
for earth: Longhair cat tail and ears

It's kind of a lot to ask, I know. But I do know a creator that does greek mythology themed cc a lot, though I can't remember their name, so if you know who I'm talking about, they may have harpy things?

I think you are talking about Natalia, I really don't remember, but if she has a harpy cc must be on patreon

For the dragon wings I suggest Nelfeah, and for the mermaid DSF or Zaneida
There is a lot of cat cc but I can't remember right now, sorry... But I can invite you to take a look at this post, here we were making a list a while ago