First I have to say, I love the plush toys, and would definitely buy them, I have to say that the toys are reasonably priced so I am very happy about that.
Now on to the action figures:
My problem with action figures is they look just like Minecraft, honestly the first thing I thought when I say them is wow I cant believe they look like Minecraft!
So they are not necessarily bad, but I think it is a branding issue.
Also I think the "lego" like figures are good since it is a game about building, but I think these toys are geared for ages 6 - 10.
I am 29 and want more collectible toys, I am not sure of the age ranges that play Terraria but I got hooked becuase it reminded my of Final Fantasy. Your game has such beautiful 2D pixel art, I really hope you come out with toys that reflect that art.
So in short,
1. Plush Toys = Awesome!
2. The art for the action figures are too close to minecraft, people will definitely be confused if the see the toy and not the packaging.
3. The toys are great for kids but not for collectors
4. Please Please Please... make the toys closer to the in game art, It is so awesome that I wish you made official posters and collector figurines that reflected it.
Oh also Congratulations on selling merchandise, that is a big step for your company, and shows just how successful you guys are!