Totosai

Totosai (刀々斎, Tōtōsai) is an elderly blacksmith yōkai and an old friend of InuYasha and Sesshomaru's father. He spends most of his time at his forge, located within a volcano, where he works to create and repair his customer's swords. When he goes out, he travels on a flying three eyed ox named Mō-Mō. He forged both Tetsusaiga and Tenseiga, the swords which belong to InuYasha and Sesshomaru, respectively. Their father entrusted him to help his two sons master their respective swords. As the series progresses, he strengthens both swords as InuYasha grows stronger and Sesshomaru grows more compassionate, the requirements needed for each to be considered more capable of handling the blades.

Much to InuYasha's annoyance, Totosai is often absent-minded and will abruptly forget what is happening, even in the middle of a battle. He occasionally scolds with InuYasha on how he uses Tetsusaiga, lamenting that his sword is in the hands of someone he feels is so unworthy. His complains have helped annoy InuYasha enough to help him increase in power.

Though Totosai often acts like a cowardly old man, he is capable of breathing fire and wields a giant forging hammer. His hammer can open large fire pits when stuck on the ground, and he has been shown to be strong enough to pause an attack from Sesshomaru long enough to allow InuYasha to get away. At the end of the series, he allows Kohaku to work for him.

In the anime adaptation, he is voiced by Jōji Yanami. In the English dub, Richard Newman provides his voice.

Source: Wikipedia