Almost 2 meter tall, his hairs are white and black and he has dark eyes. Like linley he fas a strong body thanks to his training.
Olivier seems to be cold and distant but in reality he is someone who deeply cares about his friends and family.
He is someone who can be trusted and he enjoys training.
First mentioned around the time Linley was in the Mountain Range of Magical Beasts. Olivier was a combatant of the ninth rank by age 30 and apparently became a saint at 47 during the 'Apocalypse day'. He was known as a prodigy, whose actual talent rivals that of Linley. As soon as he became a Saint, he beat the Stellar Sword Saint Dillon in three hits, and soon after challenge the Saint Haydson, whom he lost to.
During his stay in the Necropolis of the Gods, he was mentioned to have a strong soul which is useful to defend against spirit attacks.
He is also the only known person (so far mentioned as of book 11) to have been able to use both the Profound Laws of Light and Darkness simultaneously, which is a result of his Soul Mutation.
He later marries Diana and has two children, Leya and his twin brother Deia. They were, however, hunted by Diana's ex-husband, Bonin, who ambushed Olivier and his two sons and managed to kill Leya.
After this incident he go find the help of Linley with his son and so he headed to the skyrite montains.
Afterwards, Olivier with Linley's help, managed to enact his revenge upon Bonin killing him. Thereafter, he together with his only son Deia and his wife Diana, decides to once again accompany Linley.
His ability to wield both Profound Laws of Light and Darkness simultaneously also humorously affects his hair color, turning it half white and half black.