Teacher

Master is the main protagonist of the Tensei Shitara Ken Deshita story. He is a sentient magical sword that assists the story's deuteragonist, Fran.

Background
Before being reincarnated into a sword, he appeared to be a 30-year old salary man who enjoyed anime, manga, VRMMOs, and light novels. He had a friendly personality, enjoyed eating curry, and had some level of proficiency in cooking but had never dated before. He is killed at the start of the story by an oblivious driver who was texting and driving.

Appearance
In sword form, he is a white longsword with three blue lines on it. Beneath the pale gold hilt there was a sculpture of a courageous wolf and a decorative blue string. The handle was wound with a latticework of blue and white strings. He later obtains the ability to transform the shape and size of his form.

Master also has the ability to create a clone of himself, it oddly takes the appearance he once had as a human in his previous life.

Fran
Fran was the only one who managed to hear Master's calls after being trapped in the ground. After pulling him free, she became registered to him as his wielder. In return he saved her from her slave master by killing him and destroying the slave contract, setting her free. The two develop a master-apprentice bond that later grows into a father-daughter relationship. He is very protective of her and wants to help her accomplish her dream of becoming strong and evolving.

Master is in charge of cooking all of Fran's meals, often using materials from monsters that they've slain. Fran appears to enjoy eating the curry that he cooks the most.

Trivia

 * Master appears to heavily resemble and/or be a reference to the Greatsword of Artorias, used by the character of the same name from the Dark Souls video game series. While he is roughly about the length of a longsword, when used by Fran her small stature instead makes him resemble the likeness of a greatsword.  He also sports a wolf motif and possesses magical properties much like the weapon he is based on, and later obtains a wolf familiar like Artorias did in his own story.