Richard Branson calls it personality but I call it attitude:

The first thing to look for when searching for a great employee is somebody with a personality that fits with your company culture. Most skills can be learned, but it is difficult to train people on their personality. If you can find people who are fun, friendly, caring and love helping others, you are on to a winner.

“It’s better to have a hole in your team than an asshole in your team!”