"Shades" from the book series "Eragon" are not trademarked. The concept of shades as a type of creature or character is a common fantasy trope and not specific to the series. However, specific names or phrases used in the book may be trademarked.
Eragon
Ed Speleers played Eragon in the movie.
In Eragon the dragon is called Saphira and her rider is Eragon
Eragon does not have a religion.
Ed Speleers played the character of Eragon in the movie adaptation of the book "Eragon."
Characters: Eragon, Roran (Eragon's cousin), Arya (elf who got the egg to Eragon) Saphira (Eragon's dragon) Brom (storyteller/dragon rider/Eragon's dad), and galbatorix (main antagonist).
yes it is trademarked by hasbro
Eragon
Yes. This is a patented, trademarked product.
Yes, the brand Nike is trademarked.
Book one in the Inheritance Series is called Eragon. The only known riders in Eragon are Galbatorix and Eragon himself, though at the end of Brom's life Eragon learns that he too was once a rider.
It seems that, yes, he was the only one during his existence. However, in the last book, Brisingr, at the battle of Feinster, the three magicians create another shade, which is killed by Arya and Eragon.