So excited about Lego Harry Potter again! But I want to say something about the dementors. Both versions has its own charm. Some people has said the old version (the one with the pogo-like lower body piece) is weird. I remember back in time I saw an action figure of a dementor of Mattel that had the same kind of lower body part, but in a realistic style:
https://www.amazon.com/Harry-Potter-Azkaban-Dementor-Action/dp/B0001OM1RU
And many concept art of the dementors has these kind of mermaid tail-spine:
https://www.google.com/search?biw=1920&bih=974&tbm=isch&sa=1&ei=hV_8WpefNezV5gLbrINQ&q=dementor+concept+art&oq=dementor+concept+art&gs_l=img.3...31722.33520.0.33678.0.0.0.0.0.0.0.0..0.0....0...1c.1.64.img..0.0.0....0.oWmTKtH71rk#imgrc=pOQ-QP-Vw4qnuM:
So, Lego was accurately creepy about "what's under the robe"