I think, now this is tricky, 'cos I always say that any of the girls in Dragon Ball Z/GT are my favourite(s), but, I would have say Videl, because she is cool, cute, she's ব্রেভ and the strongest fighter, পরবর্তি to I think, possibly, Gohan অথবা even গোকু and Vegeta, as she took down all 3 criminals on a O.A.P bus at once, and in D.B.G.T, when we see her daughter Pan, she is the best DBZ mum ever, পরবর্তি to, I think Chi Chi and/or Bulma, but that's my theory অথবা something.
Videl. She started to be liked দ্বারা her own acts and path without taking the reason of being the hero's Mr Satan daughter. She made justice with her own hands helping to capture villains. She saw in Gohan what nobody could. She, being human, in few time, reach the ki and learn to fly. She always stand, fight even when she was losing, never gives up. She felt Gohan was alive even when nobody believes it. She had Pan. For me, she's perfect.