Garth is kind of the "ron weasly" of the main three characters in Monster Hunter: reBirth.
Garth was raised by a poor family living on an island off the coast of GuildCorp City. His father was head of a mining crew, and he taught Garth everything he knew about mining, Thinking he would take up the family job. However, when the Asteroid hit, Garth became a hunter. He still uses his mining skills, and is known as the discoverer of Crystalwood, the resource which has made Biome-H a bustling trade empire.