For me, being simply a PK badass doesn't cut it.
You have to be a playmaker, and just have that natural mover-and-shaker mentality. Honestly, the best way I can think to describe a leader is a good Iunna follower. Someone who logs on and whether or not they're a pk powerhouse, an RP savant, or just a good group coordinator they get people going.
It's something I try to work on a lot since a lot of my characters are lone-wolf types. My most successful leaders have semi-broken that mold I often cast myself in and have been more group-oriented.