Hour Cobalt is a fan name given to a a filly unicorn. Her name was given to here due to the coat of her being colored cobalt and her cutie mark being an hour glass like Doctor Whooves'. Hour Cobalt has a violet mane, violet eyes, cobalt colored fur and an hour glass for her cutie mark.
Hour Cobalt shares her design and colour scheme with Tootsie Flight, Petunia and Cobalt Shoe.