You may. We would have to see all of the facts, but under copyright law, the works at issue need only be "substantially similar," and you would also have to prove that the other company had "access" to your character, which, if it was visible online, you could possibly prove. You have copyright protection even without having registered it with the copyright office, but if you were to pursue an infringement in court, you would be required to register your copyright first, and then you still would not be entitled to statutory damages, although you would be entitled to other money damages, but the proof would be more difficult.
Answered on Aug 29th, 2016 at 5:26 AM