Because he never acknowledged the humanity of Servants, he did not understand Diarmuid's loyalty even until the very end.

Kayneth even considered the Heroic Spirits or Servants, to be part of his stock of Mystic Code. He even still displays love for her even after she blackmails and betrays him for his Servant Lancer. Kayneth cares for, and has genuine feelings for Sola-Ui, despite her loathing and disdain towards him. Upon the destruction of his Magic Circuits at Kiritsugu's hands, making it so that he can never utilize magecraft again, his goal shifts to claiming the Holy Grail to repair his Magic Circuits and recover his magecraft. The existence of Kiritsugu Emiya, which goes against such principles to the point where he completely destroys the building rather than facing him in a battle of their magical prowess, greatly angers him. He holds that all participants of the War will wish to fight honorably as magi, so he feels perfectly safe while inside his stronghold in the Fuyuki Hyatt Hotel. He prefers to hide himself during the fighting, and while technically practical, the action earns the scorn of both Rider and Sola-Ui. He is more cautious compared to those like Waver Velvet and Irisviel von Einzbern, who both openly stand on the battlefield of the Servants. He desires to attain fame by fighting other Masters of great skill, talent and caliber, and the legendary heroes of the past that have been forth. Thus, he saw the Holy Grail War as merely a fun game with little risk. The reason Kayneth brought many dangerous Mystic Codes had nothing to do with research, but for entertainment value. Although he did not severely underestimate the Three Founding Houses, he did boast that Lord El-Melloi could overwhelm them by skills alone. He did not participate in the Holy Grail War due to necessity or duress, it was merely to add a splash of 'martial prowess' to his life's story. Kayneth's reason for participating in the Holy Grail War is much like that of his student. He holds an especially great disdain for Waver's impunity in stealing his artifact and entering the War. He holds a great amount of hatred towards anyone who wrongs him, wishing to torture and kill them if at all possible. He is a cruel man with a selfish and arrogant personality. Kayneth is the epitome of how someone who believes themselves to be entitled at birth will never be happy. Kayneth in Fate/Grand Order, illustrated by pako. While his coat seems simple, its stiffly structured decorations show individualism.

He wears a navy scholar coat with white gloves, black pants, and black shoes. Kayneth is a handsome older adult in his mid to late 30's with swift back light blond hair and bright green eyes. While he loves her, she does not appear to share the same sentiments.

They apparently do not get along and Sola-Ui considers Kayneth a coward for not going and attacking the opposing Masters face to face. He is engaged to Sola-Ui Nuada-Re Sophia-Ri, the daughter of the head of the spiritual evocation division, through an arranged marriage. Kayneth originally intended to summon Iskander, but with his artifact, a piece of the torn mantle of Alexander, stolen by Waver, he instead summoned the Lancer-class Servant, Diarmuid Ua Duibhne. Waver, in retaliation, stole Kayneth's artifact and entered the Fourth Holy Grail War. Kayneth decided to tear up his student's manuscript after publicly humiliating him during a lecture. Waver Velvet is one of his students, but Kayneth cares little for him, especially after reading Waver's radical thesis concerning increasing magical potential. Although the El-Melloi faction has many powerful branch families besides the Archibalds, Kayneth swept aside the competition and inherited the El-Melloi Magic Crest. He obtained the rank of Pride in his teens, and was the youngest person to ever reach the rank of Brand. He was expected to form the greatest faction in the Clock Tower. Due to his great lineage, he had extensive connections. He was born with immense talent and rarely, if ever, encountered any hurdles in life. He has an ancient magical lineage that goes back for over nine generations. He was the youngest lecturer to grace the podium of the Department of Evocation in its history. Kayneth demonstrated genius level talent during his time as a student. Kayneth is a very wealthy and successful nobleman, a renowned magus from the Mage's Association, the Lord of the Department of Mineralogy at the Clock Tower, and a lecturer in the Department of Spiritual Evocation.

2.3 Fate/kaleid Liner Prisma Illya Drei!.

Lord el-melloi age