Vince

Vince is an unseen friend of Assets with Liabilities creator Matt Sugui who is apparently mentioned by him a lot when reminded of his pre-AwL days.

Who he is
He is one of Matt's childhood friends and some kind of an inspirational video to him. In fact, Matt literally only relies on him since he is the only one in his class (he's his classmate) that knows BFDI, and one of the two in his grade level that knows it.

When Matt describes him, he is usually described as a 'li'l c**t that can't just be sat down,' possibly referring to his school disciplinary standing.

In Assets with Liabilities
Vince is present only once in the whole show's history, notably in episode four when the Black Lung epidemic started to spread across the AwL Mansion.

Trivia

 * Vince is based on a real person, who is literally what Matt planned him to be in the show.
 * He personally asked him to be in the show.