From what I can tell personally, I haven't come across anybody who I know has a personality similar to that of the mane six, but I hope I find somebody who is similar to either Twilight Sparkle or Pinkie Pie. My own personality is very similar to that of Twilight Sparkle with the only exception that Twilight obsesses over organisation.
I remember one of my friends telling me that he was great friends with a girl he met at high school who had a personality similar to that of Pinkie Pie, but that's about as much as I know so far. It would be amazing if I found somebody who had a personality that was at least similar to the mane six.