I'll be honest, I like Crasher Wake. He's a little insane, yet down to earth enough where it's just passed off as him being funny. I just think people like that in real life are simply awesome. One of my best friends is like that. Not to mention he's a very challenging Gym Leader, since you can't use only an electric type, but yet at the same time you still kinda need them, along with a Grass type.
Gyarados=only weak to electric and rock, but it's also strong against Rock.
Quagsire=Only weak to grass (and carries Sludge Bomb)
Floatzel=Weak to both but has Ice Fang and is very fast, making Electric types more useful