Originally, Ritsuka was a novice cadet brought onto Chaldea in order to shore up numbers. After an explosion nearly wiped out the organization, however, Ritsuka became the only surviving Rayshift Master and is on a journey to correct the singularities. Now, Ritsuka arrives as the final singularity wearing a Mystic Code developed by Leonardo da Vinci and makes for the final battle ground.

Mash is a staff member of the Organization for the Preservation of Human Order Chaldea. She was given life as a Designer Baby in order to be a prime vessel for a Heroic Spirit’s soul. Her class is Shielder. After the explosion, she joined Ritsuka in their travels to correct the singularities. Despite sensing her body was nearing its limit, she decides to accompany them to the final singularity. Mash refers to Ritsuka as “senpai.”

Mash has a nostalgic soft spot for this dog-like creature. He has accompanied Ritsuka and Mash on their journeys to correct the singularities thus far. Fou has free-reign to wander about Chaldea headquarters as he pleases.

Once the head medical doctor for Chaldea, he became the acting director of the organization after the explosion. Nicknamed “Dr. Roman,” he appears to be nothing more than a kind but frail excuse for a young man. However, he is a reliable ally for Ritsuka who commits himself entirely to provide the best guidance for their journey. Before joining Chaldea, he traveled the world to acquire medical knowledge.

The third Heroic Spirit Chaldea succeeded in summoning, she is a special advisor to the Research and Development Division. Her class is Caster. A genius who left her mark on Europe in the renaissance, Leonardo da Vinci is one of the few to ever be called “omnipotent.” Her love for her own work, the Mona Lisa, drives her to recreate it in the present day. She is in charge of Rayshift backup technology.

Solomon is a Grand Caster class and the ringleader who orchestrated the demise of humanity. Once the Third King of Israel, he ruled during a time of great prosperity and was lauded as a fair and just ruler. He is said to have used seventy-two demons as familiars. Solomon put the full force of his power on display at the Fourth Singularity and overwhelmed all Servants in the area. With seven singularities corrected, he now stands in Ritsuka and other’s way as they arrive at the final singularity.