Rukia Kuchiki

Rukia Kuchiki is one of the main characters in Bleach and the person who kicks off the entire story.

She is a Shinigami (Soul Reaper) from the Soul Society, assigned to Karakura Town, where she meets Ichigo Kurosaki. After being gravely injured by a Hollow, she transfers her powers to Ichigo, turning him into a substitute Soul Reaper and setting the whole series in motion.

Key traits:

• Petite, youthful appearance (looks like a teenager despite being over 150 years old)
• Short black hair with a signature purple tint, violet eyes
• Initially very strict, by-the-book, and proud of her noble Kuchiki family status
• Wields the ice/snow-based Zanpakuto Sode no Shirayuki, one of the most beautiful Zanpakuto in the series
• Skilled in Kido (demon arts/magic) and has some of the highest Kido talent in the Gotei 13
• Over the course of the series she grows from cold and duty-bound to much warmer, playful, and openly caring (especially toward Ichigo and her friends)
• Loves cute things, especially rabbits (her drawings are famously terrible and chibi-style)

She's essentially the deuteragonist of Bleach and Ichigo's closest companion throughout the entire manga/anime. Cool, strong, adorable, and badass all at once.