Gorilla Grodd is a staple character in the Flash’s Rogue’s Gallery. He’s a superintelligent gorilla from Gorilla City, a highly advanced metropolis and he has the ability to use telepathy and is super strong.
Gorilla Grodd is public domain due to a failure to renew Flash #106 from 1959, meaning the copyright expired in 1988.
Barry Allen and other Flash characters remain under copyright. I also could find no trademark for Gorilla Grodd, but maybe i just didn’t search thoroughly enough.
Links
Wikipedia