|Game||Tales of the Tempest|
|Weight||123 lbs / 56kg|
|Height||5'5" / 165 cm|
|Japanese Voice Actor||Motoki Takagi|
As a boy, Caius lived with his foster father, Ramus, in a small village situated in a remote area of Aruera. Everything was peaceful until one day when a creature known as the Spot attacked, looking for Caius's crystal that had once belonged to an imperial guard. Hoping to protect the village, the young man attempted to fight off the Spot but the monster overpowered him, eventually forcing Ramus to change into a beast and protect his son. It was at this point that his foster father's identity as a Lycanthe was revealed to the villagers who quickly called for Lukius Bridges and Rommy to take him away. Mourning over what he had lost, Caius vowed revenge on the church and set out to save Ramus along with his childhood friend Rubia Natwick.
Caius has mixed blood, with his mother being the late Lady Melissa of the Lycanthe and his father being the human Pope. Because of this, his friends and even his foster father were unsure as to whether he would be able to transform into a beast. Forest Ledoyen especially seemed to think it was impossible, commenting on how all Lycanthe have a special mark on their bodies that allows them to shapeshift.
After the party jumped from the river around Janna to escape the Black Knights, Caius, Arria, and Ramus got separated from the party and wounded up on an unknown shore. There, they encountered Rommy, who then used her magic to forcefully transform Ramus into his Lycanthe form and make him attack Caius and Arria. Caius was then forced to battle his own father. After Caius defeated Ramus, Rommy turned Ramus into stone, thus ending his life. Caius, fueled by rage and the desire for revenge, transformed into his Lycanthe form. With very little control over his Lycanthe form, Caius went berserk and quickly defeated Rommy in a battle. Rommy, realizing that Caius was too powerful, retreated.
Tales of Hearts
Tales of the World: Radiant Mythology 2
Caius appears alongside Rubia as playable characters in Radiant Mythology 2. They are two of the first nine party members the player can select from. Caius and Rubia are part of Chat's guild on the Van Eltia. They have no purpose in the story except in the beginning when they introduce themselves, but after that they hardly do anything to move the story on. The player has the option on going on hunting quest with the two most of the time. After Goede is finally defeated, he and Rubia are on the Van Eltia looking at the mana spreading across the world
Tales of VS.
Caius appears as Tales of the Tempest's sole representative, and is one of two characters, the other being Richter Abend, in the main game whose origin is from an Escort Title. During the game, he ventures with Mao from Tales of Rebirth. During one part of the story, Barbatos Goetia from Tales of Destiny 2 influences Caius's Lycanthe blood to go out of control, and attacks Mao.