Fairies are not portrayed as cute little girls with insect wings, except in children's fiction or at those parties you have at Maccas or Hungry Jacks (Burger King) when you're like 5. At least not portrayals I'm familiar with. The most prominent image of the fairy, even to this day, is a terrifying demonic little *******, sometimes with a cute pretty facade. Unless you count Thumbelina, I guess. But that's from the 1800s. But then, I don't really read up on my erm fairy folklore. So maybe I'm just out of the loop.
Leprechauns tend to be either or, as far as I'm aware.