Bleach is a popular shonen anime featuring Ichigo Kurosaki as the protagonist, who transforms from a high school student to a Soul Reaper hero. Rukia Kuchiki, initially portrayed as weak, played a pivotal role in the story. Here's how Rukia's character arc drove her transformation from weakness to strength in Bleach.
When Bleach began, Rukia Kuchiki was a token supporting character and couldn't fight the weakest Hollows due to her personal fears and insecurities. Rukia's mind was clouded with guilt for killing Kaien Shiba and for her cold and distant relationship with her foster brother, Captain Byakuya Kuchiki. Additionally, she was not confident about her swordsmanship skills, and her sub-par performance in combat made her appear weak.
However, Rukia's character arc allowed her to overcome her inner demons and become mentally stronger, leading to an increase in her outward strength. She began to scale up accordingly and defeated even the most challenging of Hollows, but not before she had mastered herself.
As Rukia's mental and physical strength went hand in hand, her arc took off during the Soul Society arc. She confronted her fears, apologized to Kukaku and Ganju Shiba over Kaien's murder, and cleared her head. With the Soul Society's ambient spirit energy, Rukia powered up gained clarity of mind and strength of will, and was ready to fight the Arrancars in the subsequent arc.
Rukia's character arc led to her growth as a fighter, and she became braver and more self-assured than ever. Her brand-new ice powers and bankai were evidence of this transformation. However, it was Byakuya's emotional support that made Rukia happiest and proved that her mental state was the real key to her power as a Soul Reaper.
In conclusion, Rukia Kuchiki's character arc was pivotal in her transformation from weakness to strength in Bleach. Her growth as a fighter was directly tied to her inner demons, which she conquered over the course of the series. As a result, Rukia emerged as a strong and capable fighter, who proved that mastering oneself is the first step towards conquering external challenges.