Rio Kastle

Rio Kastle is the younger sister of Reginald Kastle and a student of Heartland Academy, later on she is revealed to be Marin one of the Seven Barian Emperors.

Past life
She was known as Marin in her past life, she was a priestess as well as a princess of the United Lands of the Poseidon Ocean alongside her brother Nash. One fateful day their kingdom was attacked by a ruthless prince known as Vector, who led a army of soldiers to plunder the castle by using Gorgonic Guardians which in turn failed. and then Vector killed one his men and used him as a sacrifice to summon Abyss turning things in his favor, and Marin decided to sacrifice herself and plunged herself into the depths of the ocean and summoned Number 94: Crystalzero which was due to the Barian deity Don Thousand and was later revived as one of the Seven Barian Emperors.

Trivia

 * She owned a Barian Card called Number 103: Ragnazero & C103: Ragnafinity.