She was voiced by Ana Gasteyer.
Krolia is known to be the member of the Blade of Marmora when she crash-landed on Earth and she was found by a human, who is Keith's father. She and the human eventually fell in love and had a son named Keith when they discovered a Blue Lion and protect the lion from the Galra.
Krolia is a woman of great loyalty, discipline, and principles, as she managed to complete her mission to destroy the Galran superweapon without compromising her son's safety while simultaneously double-crossing her enemies in order to satisfy her own agenda and orders.
As a spy for the Blade of Marmora, Krolia was a profoundly skilled actress, able to lie to the Empire about the location of the Blue Lion, preventing their discovery of it for the better part of twenty years.
- After she gave birth to Keith, Krolia wanted to name him "Yurak" is a reference to the 80's series Voltron: Defender of the Universe, but his father decided to name him "Keith".