Nigel (Homer's Barbershop Quartet)

Nigel is the former agent for the group The Be Sharps. He supposedly has a tattoo under his hair.

History
He discovered the group while they were performing at Moe's Tavern, where he became their agent. The group did as he told them, even making Apu change his long surname of Nahasapeemapetilon to another long name(DeBeaumarchais) He consistently tried to trick his clients and take advantage of their success.

Non-canon
Nigel once became the agent of Santa's Little Helper after he became famous. Once again he attempted to make a profit off of his client's success, even going so far as to thwart Bart's efforts to win his dog back.

Nigel was also the agent of the short-lived boy band 5 From 'Field.