Can Akua Appraise your character: Y
What is your character's role in their canon?:
Mentor | Love Interest | Dueteragonist

Despite not being the protagonist, Rin is actually the character with the most screen time in the story. She serves as the narrator for the prologue, and also the narrator for the Heaven's Feel (the route she's taken from) epilogue. She'd the subject of the school's rumor mill, popular but isolationist, the protag's crush before the story begins and one of the main lenses in which the world of magecraft is learned about.

Rin is the keystone in which the story pivots around. In one route she is merely the mentor and the protag's crush diverts to another, in another she's the main love interest and teammate, and in the route from which 'this' Rin is plucked she is the prior crush and sister to the main love interest. This story follows the conflict that the world of magecraft has placed on their family. In every route she saves the protagonist's life in the beginning for the sake of her sister's happiness.

What are the High Points of their "Story"?:

Before the age of seven Rin lived a life virtually untouched by the way mage society would one day shape her life. She lived with with her father, mother, and younger sister in a large western-style mansion in Japan. However just before, or perhaps right around the time she turned eight her sister was adopted away to another family and her father participated in a "fight to the death" ritual amongst mages to seize the infamous wish granter: The Holy Grail.

The Holy Grail War ended with her father murdered, her mother disabled, and Rin subjected to being the ward of her father's apprentice (and unbeknownst to her, the man that killed him). Ages 8-12 consisted of Rin teaching herself magecraft, and caring for her disabled mother who died right around the time she reached middle school. From then on she was raised by the man mentioned before — a sadistic priest known as Kirei.

Late into her high school career is when the next Holy Grail war starts. She takes up the legacy of her father and participates — pitting her against her sister and other mages (including the protagonist). Things get fucky, but the highlights are:

✧ She saves the protag's life
✧ Love triangle drama, though Rin doesn't see it that way
✧ Sakura's (her sister) body gradually going haywire and becoming a vessel for "All the Evil in the World"
✧ Rin losing her partner (Servant) and the highlight of how her life has been just a series of partings/farewells
✧ Right before coming to Kenos Rin has made the decision to "kill Sakura in order to save the world" (inwardly she's very conflicted about this)

The big takeaways are:

✧ Guilt over her sister being sent away
✧ Strict adherence to "mage ideals" to uphold her father's legacy despite resentment toward it
✧ Self-imposed isolation due to "mage ideals" but also out of a fear of losing anyone she might consider close or dear
✧ Weird sense of "obligation" in order to justify keeping people close without acknowledging emotional attachment
✧ Hypocritical or contrary behavior as she struggles with true self vs ideal heiress mask

Is the Character a Hero, a Villain, or Neither?: Rin wouldn't consider herself a Hero, but others would probably label her as such.