You know those kids who are so intelligent it's almost annoying? Well, Alex Dunphy is super smart but in a completely likeable way.
She's the middle child which means she enjoys messing with both her older sister and younger brother equally. You kind of get the sense that Alex is an outside observer to the antics that surround her while quietly doing her own thing. As much as she enjoys torturing her brother and sister, you get the sense that she'll always have their backs.