The Willing Warlock
is a character in Charmed Life
and "Warlock at the Wheel
His name is never given, only the description by which he advertises his services: "warlock" (equivalent to witch
) is the least powerful type of magic, and "willing" appears to be simply advertising (as well as a dodge to avoid mention his precise, unimpressive, qualifications), and probably doesn't have any technical meaning.
He is a muscular young man who always needs a shave. He tends to be hired for shady jobs like making the wrong horse win at the races, or jobs that involve heavy lifting.
The story "Warlock at the Wheel" tells what happened to him after the events of Charmed Life.
See also Charmed Life (spoilers).