the sort of person you would describe as having a good personality (idea)

There is a fairly funny TV Ad here in Australia that goes like this:

First Bloke: How's your new girlfriend?
Other Bloke: Oh, Linda? She's got the best personality. What about your new girlfriend?
First Bloke: She's butt ugly as well.

With the catchphrase of this commercial to drink a certain flavoured milk product, and be yourself.