Rin Tohsaka

(events from Fate/apocrypha)

Tohsaka was summoned by a mage from the Clock Tower named Kairo, who told her about the Yggdmillennia and the Grail

Kairo: So there will be two factions, the red faction and the black faction. The Association of Mages, along with the Church, represent the red faction; the Yggdmillennia represent the black faction.

Rin: I don't plan on participating, thanks.

Kairo: I'll give you the two gems you wanted in exchange.

Rin: Okay, I'll participate now. Give me a catalyst.

Kairo gives him a piece of wood

Kairo: That's a piece of the Round Table; with that, you can summon a sword-class servant: Tristan, Lancelot, or even King Arthur himself.

After a while, Rin is in the forest at night summoning her servant

Rin: With this, I will summon a knight of the Round Table, only the best of the best.

Rin makes the magic circle and places the catalyst in the middle

Rin: answer my call and lend me your strength, show yourself to me now.

A figure begins to emerge from the magic circle with the catalyst

He/She hates people who don't think clearly.