The lawyer is under Gideon Gleeful's employ.
He comes to the Mystery Shack claiming that Stan has won a million dollar check for Winninghouse Coupon Savers. Until it is revealed to all be a trick by Gideon in an attempt to steal the Mystery Shack.
The lawyer wears a dark blue suit accompanied by a red and yellow striped tie. He has gray and black hair and a rectangular face.
Alex Hirsch's Twitter Prank
Just before the premiere of "Little Dipper", Alex Hirsch posted on twitter a picture of the "Unnamed Lawyer" saying it was "Mitt Romney's appearance in an Upcoming Gravity Falls Episode" and that Grunkle Stan and he would bond over a "love of not paying taxes." He later posted that the comment was a prank.