Darren Leffew

Darren Leffew (or as Darren the Boxer) is Mr. Leffew's brother who only appeared in one episode of the series so far.

Personality
As a boxer, Darren Leffew is not afraid of taking care of anyone who gets in his (or his brothers way), and would be more than happy to send them to the hospital (to put things in kinder words).

Coverage
In "Dirty Cursor", he appears from almost nowhere after Mr. Leffew tells Mr. Horsey that he wasn't responsible for a prank telling Mr. Horsey to stop accusing his brother of pulling the prank on him otherwise he'd have to leave his building. Mr. Horsey still thought that Mr. Leffew was lying, and thus would make sure he got payback. Before he could do that though, Darren promptly beat him up to protect Mr. Leffew. Later on, when no one was near Mr. Horsey, he threatened to murder both of the Leffew brothers for lying to him about the prank once he saw them again.

Trivia

 * He's the first character in the series to appear in person that isn't a main or secondary character.