Keros

 Keros (ケロース) is a Unicorn that appears in Monster Musume: Everyday Life with Monster Girls Online.

Skills and Traits
Keros has exceptionally high health and defense, but somewhat subpar speed and attack.

Her Defensive skill gives her a chance to completely evade enemy attacks.

Zoological Classification
Unicorns are a demihuman subspecies of Centaur that have had myths and legends written about them since before Greecian antiquity.

Known as a symbol of virgin purity, Unicorns are said to be "only tamable by virgin women". It is said that their horns are able to cure all diseases; resulting in a mass-hunting for the species. Hunters usually used the species' fondness for virgin women to lay traps to capture them and harvest their horn.

Trivia

 * Her name is based off the ancient greek word "keras" meaning horn.
 * Keros can be obtained for free as a quest reward after feeding your Homestays 100 times.