While Felix's personality varies by adaption, he is generally always portrayed as mischievous, but good-hearted, and willing to help others in need. Notably, a lot of his 1920s shorts revolve around him trying to get food by any means necessary, even going as far as stealing from other people.

In the 1936 cartoons, he is portrayed as more innocent and child-like, and thus less mischievous.

In the 1950s cartoon and later incarnations, he is shown to have a fondness for puns.