Zenon Griffey/Relationships

Head Librarian
Fellow Cult member, infiltrator, and former instructor, It is unknown when exactly Zenon became the Head Librarian's student in swordplay. However, the Librarian has noted him to be a terrible student most likely in due to their contrasting personalities as the Librarian was humble and unassuming while Zenon was self-entitled and egotistic.

Lutheran Barnett
Fellow Cult member and infiltrator, Lutheran fell out of favor and lost his position of 12th seat when he was suffering from chronic illness. The Round Knights saw Zenon's potential as his replacemevnt when he demonstrated his strength and abilities but lacked the achievements to warrant the position. Due to this, he was set as a candidate for the position until he tried proving it by harvesting Alexia's blood and offing Shadow for the promotion.

Perv Asshat
Second Child and candidate for the 12th seat position. After the instructor and assistant principal's death, the duke sought the position by infiltrating Oriana as the royal chancellor under Mordred's support. He was close from succeeding when Cid pocketed his engagement ring and was killed when Rose exposed him and his plans.

It is unknown whether Zenon was aware of the Chancellor's engagement or Rose's possession symptoms.

Archbishop Nelson
An original member of the Cult and 11th seat of the Round Knights. Nelson was responsible for the creation of Diablos Tears and mass production of it's normal variant. Zenon's death resulted in the discovery of the Cult and their connections to not only Midgar but to the Other World when Alexia investigated the priest for unrelated reasons.

Alexia Midgar
His former arranged betrothed and student. From the very beginning, he did not mind with the arrangement but preferred Iris while Alexia despised him for his impeccable façade and forced future on him. As a result, she started her relationship with Cid as a way to annoy Zenon, but he easily saw through and let it continue before telling her to get used to their engagement.

In due time, he had her kidnapped and revealed he was harvesting her royal blood for an experiment. While revealing his true nature, he proceeded to belittle her for her mediocrity in swordplay and abilities. Zenon even sarcastically apologized for comparing her to her sister but did not hesitate to brutalize and recapturing her before Shadow intervened. After his death, Alexia did not feel anything and was glad of his death and newfound freedom when she confessed to Cid.

Iris Midgar
His would-be sister in law, Iris respected Zenon enough to entrust him of leading the investigation regarding the disappearance of her sister. Iris was unaware of his true nature and upon learning that he was the mastermind of Alexia's abduction, she was shocked of the revelation and apologize to Cid for suspecting him during the Bushin Festival.

Cid Kagenō / Shadow
Student and scapegoat. Cid was briefly his student when Alexia began to date him out of spite. Initially on avoiding the course, the Princess recommended him into his class under coercion. Like her, Zenon saw Cid as the perfect patsy when he framed him for her kidnapping.

As Shadow, Zenon was aware of his existence as the man who had taken down several cult hideouts. In battle, he completely underestimated the leader of Shadow Garden when he thought too highly of his own abilities. This resulted in him being on the receiving of an belittling one-sided fight and was completely shocked when he could easily parry his attacks blow by blow without budging.

Zenon then lost all composure and gave in to his rage by shallowing the Tears of Diablos to become the "Third Awakening". Despite being in his Awakening form, Zenon was still bested by Shadow's swordplay and he would met his end when he used his "I Am Atomic" attack to annihilate him alongside his hideout.

Rose Oriana
Queen of Oriana and affiliate of Shadow Garden, It is unknown whether Zenon was aware of her engagement or possession symptoms. However, his death inadvertently forced Rose into hiding from his fellow candidate and eventually become a member of Shadow's organization. It was after freeing Oriana from the Cult that the former princess became the sole heir and left Shadow Garden as affiliate.

Millia
One of the Cult's test subjects under Zenon's custody, It is unknown whether he was aware of her identity or father. However, her intervention in freeing Alexia allowed her to discover the both the Cult's and Shadow Garden's existence firsthand as well as his true colors.

Claire Kagenō
Cid's elder sister, It is unlikely Zenon was aware of her past instance with the Cult or her Demon Possession symptoms. During his report to Iris regarding Cid's interrogation, Claire barged in to confront Iris of his condition and threaten her to release him. She would have stopped at nothing for her brother even if it meant going against the Knight Order and his instructor.

In the Light Novel, Zenon tried to stop her from confronting Iris by warning her of the incautions of pressing further in the matter. He threw her out of the room when she threaten Iris about Cid's condition In the anime Rose stopped her from confronting Iris which Iris asked Zenon who she was. Upon his careful response, Iris decided to release the student's brother under his supervision.