Title: Founder of Herd Airistos
Airistos founded the herd of pegasi named after her. After the herds reformed, she chose Nike as her successor. It's not clear what happened to her, but she probably passed away soon afterward.
There is only one existing picture of Airistos; it depicts her as a carousel horse, adorned with tack, wing decorations, and pole. However, other than that, it's fairly easy to discern her actual appearance.
Airistos is an icy blue pegasus with a curly and darker blue mane and tail. Her large, feathery wings contain both colors.
Airistos can fly, of course, but she also emits sparkling white magic from her hooves.
Look to the sky for comfort. Above the clouds, it is always blue.