Hi. I looked up a lot of website in google. There are so many websites with diferrent prices. Can somebody help me to find a trusted website to file copyright for my own game character please ? Thank you so much.
You can file directly with the US Library of Congress.
I would suggest including all work associated with the game in one filing as there is a filing fee.
https://www.copyright.gov/registration/
You do not have to file to have copyright of your work and as soon as your work is put in tangible form you own the copyright to that work and you can include a copyright notice on that work however without a registered copyright you would not have the additional legal protections and collecting any legal costs would not be covered if you sued someone for infringement.