|Character type:||Human, Master|
Little is known about Sagara's background or affiliations, but it is known that before becoming a master he was born from a lineage of magi that was commonly looked down upon as "rats". Before the Grail War, he was living with a prostitute by the name of Reika Rikudou, who was unaware of the existence of magecraft, and at some point in time he managed to gain possession of Jack the Ripper's knives.
Little is known of Sagara's personality, but from his actions it can be gathered that he had little respect for human life, willingly trying to sacrifice Reika for his own ends. Furthermore his actual desire for the grail ahead of his own well being is unlikely as he would have had Jack sooner kill herself and lose his chance than enter with a faulty servant.
Sagara's over all role is negligible. After summoning his servant, he is quickly dispatched by her. Despite being kept alive through Jack's medical skills, he had lost all ability to command her or supply her with prana. At Reika's suggestion, Jack consumes his soul to maintain herself, ending his life.
|Servant summoning ritual|
Fill. Fill. Fill. Fill. Fill. Let each be turned over five times, simply breaking asunder the fulfilled time.
Sagara is a second-rate magus, and due to the unique properties of the Fifth Holy Grail War, that of fourteen Servants being summoned, he must make up for the Holy Grail's lack of strength in supporting his Servant. He is the type of magus unsuited to combat because his house's magecraft that has been passed down through the generations is specialized in more unspectacular abilities likes suggestion and concealment, causing them to be ridiculed as "rats." He follows this notion by using tactics rather than power because a "rat can kill in ratlike ways." He fights like a fierce sewer rat with cunning and a tenacious attitude.
Due to his rank as a magus, he does not believe that he can bring out the true power of or properly utilize the primary classes like Saber or Lancer, and he wishes to avoid the uncontrollable Berserker class. He feels Assassin is most suited to his abilities, but wishes to get around the problem of their identity of Hassan-i-Sabbah being known simply from finding out their class by summoning Jack the Ripper instead. While he obtains the Command Spells, Reika is the one to attain the actual Master and Servant connection, so Jack is forced to maim him so that she can keep him from commanding her and transfer the Command Spells to Reika.
Sagara, as a user of magecraft, is at least capable of performing the basic summoning for a Servant and understands the ritual enough to surmise his initial faults and incompatibility with the spirit he is attempting to summon. His combat ability is unknown, but he does succeed in mortally wounding Reika Rikudou to use as a sacrifice.