Kyōko first appears in episode 261 of the anime. She comes across as quiet and reserved at first, though she's genuinely talented—athletically gifted across multiple sports and sharp academically, with an almost eerie ability to predict what teachers will put on exams. Fans often note her perceptiveness; she figured out Orihime had unusual powers just by watching her, before Orihime ever demonstrated them openly.
What makes her character compelling is the loneliness underneath. She'd been hurt by Mai Suzuki, the only person she'd ever really considered a true friend, and that alienation left her convinced she'd never fit in anywhere or be accepted by anyone else.
Content compiled by AnimeList.moe from publicly available sources.