Fafner-Shifter Monk.

Born in a simple artisan family, his father was a blacksmith and his mother dabbled in pottery. Being born with lycantropic genes, he was naturally very strong, so his dad had him aid in Smith work, however even though he was apt at hammering metal and carrying things, he often always get carried away, hammering the metal too fiercely or carrying too much at once and falling, damaging the goods. His parents eased up on trying to make him into a craftsman, they instead thought on how he could put his raw strength into good and honest work. He was raised well by his family, even though he had bouts of anger and had poor impulse control, his parents were patient with him.
Despite his friendly demeanor and sincere personality, most of the friends he would make would quickly drift away because of his impulsive nature and his unnatural strength, Often going too far with something they were doing for fun, like play fighting or breaking things he was given. He'd be quick to anger and scare away people.
One day monks from a nearby temple talked to his parents about training him, thinking this was a good opportunity for his talents to prosper, they sent him to train with the monks. The monks saw him a skilled warrior, but lacking in Discipline. They've tried their hardest to teach him their disciplines and philosophy, but it would go in one ear and out the other.
After one day overhearing the monks discuss how to handle their problem student, even considering kicking him out. He though to himself "I want to be useful, I want to help nice people, I want to do something with this gift I was born with. I want have friends to protect and have fun with" He confronted the monks, he knew he was simple, he was a savage person that enjoyed the thrill of fighting someone and loved building his body, yet he wanted something to devote himself toward, people to share his life with. His parents had given up on having him become a artisan, he did not want the monks to have him give up on using his body for something fruitful. the monks took his words to hard and started changing their methods. They simplified their teachings, they asked him to not think on them, but simply feel these concepts and act on them.
With renewed drive for him and his teachers, he had trained hard and long, after some time he had become a star pupil as a warrior. His mental exercise had bore fruit while still carrying a rough and somewhat aggressive disposition, he had grown more calm, he learned how to think off of his more positive feelings. He followed the orders of the mentors who knew better, he had selflessly aided those around him, he had mastered the beast within and directed it towards a kinder purpose. He still carries some of his impulsive and hot blooded nature, but shows restraint until pushed to act and lash out.
He enjoyed his time in the temple, helping his friends and teachers and enjoying the life he was given. but he had decided he wanted to make his own community, one of people he could help and protect the way the monks had done for him. He had left to adventure and give aid and form bonds.