The phrase "common trait" refers to a characteristic or quality that is shared by many people or things. It is something that is frequently seen or found in a particular group. Full definition
That's one of the most common traits of the political player. (sciencemag.org)
What makes it difficult for people looking for a date is looking for someone who shares common traits and interests. (bikerdatingsite.net)
To western humans, this seems bizarre, but lactose intolerance is actually a far more common trait in adult mammals than the ability to digest lactose. (petconsider.com)