That's like asking, "Why do you like Ash, May, Dawn, or Iris?"
Regardless of your last statement, your question doesn't really come off as genuine or sincere to me but seems to be undercover bashing in disguise.
I don't expect this to last long, but I'll play along.
I like Misty because she was the first female traveling companion for Ash.
She trains water pokemon, and that's my favorite type. I also love her design. Orange hair with green/blue eyes.
I also really liked her personality. Hot-headed and feisty on one hand, but then really tender and sweet on the other.
That about sums it up for me!