Who is The Mechanic from Fight Club and what is their importance?

The mechanic appears as one of the stronger members of Project Mayhem. In his job as a mechanic, he is looked down upon by white collar members of society. This makes him the ideal type to embrace Tyler's goals of leveling the societal construct as they know it and creating fair distribution of wealth. He trusts Tyler unconditionally and acts out many of Tyler's wishes, despite the narrator arguing against them.