Electric, too bad we can't give it Levitate, that's not neglected.
It has a single weakness, which allows us to be creative with the secondary type. In OU for electric, we have Zapdos, Jolteon, Magnezone and Electivire. All save Zapdos are sweepers. We could be very creative with this CAP and take it a different direction. Electric can also be used with a lot of different abilities well. And it's associated with yellow, my favorite colour. I actually thought of Electric before I even saw it's basically already won.