Kenshin Himura, the protagonist of the manga and anime series "Rurouni Kenshin," uses a reverse blade sword as a reflection of his personal philosophy and desire to atone for his past actions as an assassin.

In his past, Kenshin was a feared and skilled swordsman known as "Hitokiri Battosai." He carried a regular, sharp-edged katana during his time as an assassin, which he used to take numerous lives. However, after realizing the destructive consequences of his actions, he vowed to never kill again and sought redemption.

To symbolize his commitment to non-lethal combat and his repentance, Kenshin modified his sword by reversing the blade. By using a reverse blade sword, the sharp edge of the katana is turned inward, making it impossible to deliver fatal cuts. This allows Kenshin to engage in combat without the intention of taking lives.

The reverse blade sword represents Kenshin's transformation from a merciless killer to a protector of peace and justice. It serves as a constant reminder of his past, his determination to protect lives, and his dedication to atonement. By using a non-lethal weapon, Kenshin seeks to make amends for the lives he took and to uphold his newfound principles of mercy and compassion.

The reverse blade sword becomes a symbol of Kenshin's unique fighting style and his commitment to a non-violent path, which sets him apart from other swordsmen in the series.