I know the Pokemon/Nintendo company is VERY aware of our selling custom plushies and they actually support and encourage it because it is another way of advertising. As long as we don't claim them to be official and make sure it's obvious that it' a custom, they're cool beans. Most of Japanese brands share this view. America is much less supportive, but I know that Hasbro was aware of a popular Transformer artist selling transformer plushies she made and really didn't care. Most often, if you don't claim it to be yours, then they're not going to waste hundreds of thousands in lawsuit dollars on one isolated instance. Plus at cons, sometimes the official people are there and they must be aware that at the artist alley tables, there is tons of fanworks being sold and they sometimes even buy those works, so yeah.

I didn't advertise my pony pattern strictly as a MLP pattern. I say that it's a pony pattern and that it works really well with MLP characters :3 the example is actually the naked pattern and then I show that I used it to make PinkiePie. So there's that.

And anyone can make Pokemon scarves, though I could see it being irritating to have another artist making your same thing.