Feardorcha O'Neill (ファードルハ・オニール) is a student of Seidoukan Academy.
Feardorcha has long, dark chestnut colored hair. Due to the cost of his Orga Lux, he was morbidly thin.
Feardorcha is shown to have had a close relationship with his Orga Lux, understanding how it felt, and was skilled at using it. His reason for entering the Lindwurm was to make it his personal possession. When it was destroyed, he was extremely emotional and fainted.
- Orga Lux: Feardorcha used the Orga Lux Snake Sword Ororomunt (蛇剣オロロムント) for around 4 years until it was destroyed by Hilda Jane Rowlands during the Lindwurm. It allowed him to inflict a bewitching poison on opponents at the cost of a drug like euphoria and dependency, along with small prana usage.
Genestellar (星脈世代): As a Genestellar, Feardorcha has enhanced physical ability and an aura known as prana.