Mosuke

Mosuke was once a great blacksmith and the childhood friend of Amidamaru.

Personality
Mosuke, even though he usually acts like a calm headed adult, can, when he is with Amidamaru, become like a child again who cannot restrain his emotions, as seen when they finally met as spirits in volume 3 of the manga series, where He punches Asakura Yoh right in the face.

Past
In his childhood Mosuke lived alongside Amidamaru and several other orphans in the feudal Japan. He had been taught by his father how to forge steel and metal. He made the sword Harusame ("Sword of Light" in the English Anime) out of his father's knife.

Present Time
After Amidamaru revealed why he could not leave to Yoh and Manta, Yoh dragged Manta to museum in order to see the sword. It was then Mosuke made his first official appearance. He was sitting upon the blade awaiting the day he could bring it back to Amidamaru. However he had done so for about 600 years and had begun to cry on the sword at night.

Anime/Manga Difference
In the manga Mosuke goes to the otherworld after meeting with Amidamaru in volume 3. He is later summoned back when the Archangel Michael breaks Harusame so that he can repair it. However, in the anime he appears again when some spirit sealers want to seal Amidamaru and then uses a controlled Mosuke to posses Oyamada Manta and attack Yoh and the others. However Manta figures how to create an oversoul and uses his laptop in combination with Mosuke to create a large hammer. Later on it is revealed that Mosuke has become trapped inside the laptop.

http://upload.wikimedia.org/wikipedia/ru/c/cb/Manta_dux.JPG