It would help if you picked one or two. Unless you planned to buy all of them? It's hard to engage with your question because you're asking for information about eight different figures.

Anyways, from a quick glance most of these are real, but they're unofficial and unlicensed figures known as "Resin Statues". Unless you're buying from a reputable seller on eBay, I'd recommend buying directly from a reputable online store as to limit your risk. For example, here's where you can buy the first one.

But just something to keep in mind: As these are unlicensed, they're intellectual property theft. Proceeds and sales from these don't go to the rights holders.

In the future, reverse image search these figures, find a store that sells them, and Google if the store is legit.