The Winged Unicorns are Special and rare Unicorns, only belonging to one family in Centopia. They have Wings and ability to Fly and also posses Special Powers and Horns.
Possibly, Ono, Onchao and Kyara are the only Winged Unicorns that we know of.
As of Mia and Me: Hero of Centopia, another winged unicorn is introduced, the stormy unicorn.