Mujina

is a male badger yōkai in disguise as a young human female child who used Shippō, attempting to get the yōki of Tessaiga, so that he could take over the world. He used his version of the yōkai sword Dakki in order to do this, but the blade was too weak that Inuyasha could even shatter it with one swing of his then weakened Tessaiga. Mujina's version of Dakki eventually made Inuyasha getting interested in the ability of to absorb yōki with yōkai sword and wondered if it was possible to transform this power to his Tessaiga. Inuyasha's resulting thoughts from his battle against Mujina and Dakki led him and his friends to the encounter with Tōshū.

History
Initially, he was in the form of a pretty human girl. His first act was to take Shippō hostage and take him to his den. His goal was to make his sword Dakki stronger by absorbing the yōkai powers; prior to Inuyasha's group's arrival, he had been drawing out the energy of increasingly powerful forest yōkai and driving them out of their home. As Tessaiga's demonic power was too much for Dakki to absorb, he thought to use Shippō as a shield. Inuyasha's rash act of destroying the den while Shippō and Mujina were still within, however, caused Shippō to decide to help Mujina take Inuyasha's power. Mujina's claim that he intended to use this power to avenge the death of his father, who he claimed was killed by an evil yōkai, only made Shippō sympathize with him even more.

Once he had taken enough power into his sword, however, he attempted to kill Inuyasha and revealed that his actual goal was world domination. When Inuyasha showed up alive, he again attempted to play on the group's sympathy; when Shippō fell for his tricks and tried to defend him, he quickly took Shippō hostage again. Inuyasha soon forced him out of his disguise and revealed him to be a big male badger. When Shippō found out Mujina wasn't actually a girl, he looked horrified and embarrassed; it was implied that he may have had feelings for 'her,' or possibly he was just ashamed for falling for Mujina's trick. Inuyasha easily broke Dakki, which caused the stolen demonic powers to return to Tessaiga, and kicked Mujina away.

Powers & Abilities

 * Shapeshifting: Mujina was shown to possess the ability to shapeshift into the form of a young, pretty looking human girl.

Weapon

 * Dakki: Mujina had a much weaker version of the real yōkai sword Dakki (the one forged and used by Tōshū), which he used to absorb the demonic energy of Inuyasha's Tessaiga; he absorbed the Kaze no Kizu and tried to use it on Inuyasha, though it proved to be far weaker than the original. Even though this fake version of Dakki was a lot weaker than the real demon blade that was in possession of its creator Tōshū, it still managed to steal all of Tessaiga's yōki.

Trivia

 * It is unknown how he happened to get his version of Dakki into his hands.
 * Mujina has shown to be capable to use the ability to shapeshift, however, it was not explained if he only was able to transform himself into shape of a pretty looking human girl or if he also could transform his appearance into other shapes.