Tetsusaiga is a powerful sword wielded by Inuyasha, a half-demon character from the anime and manga series Inuyasha created by Rumiko Takahashi. Forged from the fang of Inuyasha's father, the sword has the ability to protect humans and can absorb the power of defeated enemies. The sword is known for its unique ability to transform, allowing Inuyasha to unleash various attacks. One of its most notable features is the ability to create a barrier that protects humans, reflecting Inuyasha's desire to protect his friends and loved ones.