Caster of Red is the Caster-class Servant of Jean Rum of the Red Faction in the Great Holy Grail War of Fate/Apocrypha.

Placing the importance of the Story above all else, he lies and cheats and by any means conduct himself that he might witness the unfolding of a grand tale, beautiful beyond compare. Consequently, he tends to distance himself from mentality of the "participant," taking instead the perspective of an abstract, "Authorial" third person. His regard for others differs by individual, dependent on their qualification as a special existence, or "protagonist." He interacts with "normal humans" only in a shallow, dismissive manner, and expresses an extreme interest in "protagonists." In slight narcissism, he frequently drops such self-authored quotes as, "Things bad begun make strong themselves by ill." He's taken a liking to certain terminology from modern fiction, such as "Death-Flagging." With short and effective words, he brings to light that what humans usually keep hidden. This is like suddenly being poked by rambling, incongruous words, so one would probably feel shocked.

As the world is the greatest story ever told to him, or so it ought to be in his eyes, he willingly employs deception, provocation, or anything else for the sake of spinning the story. He greatly loves those who are out of the ordinary from the bottom of his heart, perusing the tales they spin. With greatly exaggerated outbursts of emotion, he acts as he wishes, gracefully admitting that it is suitable to call him a trickster.

||Caster's true name is William Shakespeare (ウィリアム・シェイクスピア), a poet and playwright from the Elizabethan England.
His father was an affluent man in Stratford, but it is uncertain if Shakespeare received a higher education. Half of his life is shrouded in mystery and there are many mysteries in his career, such as an undocumented gap of seven years. In his early days as a playwright, his productions revolved around comedy, then historical drama, before he changed his style for magnificent tragedy. At the same time, he also played as an actor in the underground, and he was the target of slander and derision from influential people. In any case, he just had to write a few works and his reputation didn't know where to stop. Considering how he was belittled by a senior playwright as a "upstart Crow" at the time, it seems that he was quite envied.
He is the only playwright whose fame has reached around the world, he is representative of authors of the western world. His name shines brilliantly on the history of English literature, his popularity as a great man from England is the highest possible. Still having a large influence over modern literature, it can be said that those with no knowledge of his works are to be disparaged as ignorant. It is also said that those looking to trace the source of any piece of modern literature will always find a Shakespearean creation. Having written too many masterpieces to list, his four greatest tragedies rising above all others are "Othello," "Macbeth," "Hamlet" and "King Lear."||

(Source: Type Moon Wikia)

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