Black Noir is black in the comics. The creators have designed the character in such a way to give a specific look and feel, and the black complexion is an integral part of that design.
Well, Black Noir's demise in the comics occurs as a result of multiple factors. There's a combination of powerful enemies, internal conflicts, and strategic miscalculations that lead to his ultimate fate.
Black Noir kills Homelander in the comics by catching him off guard and delivering a fatal blow that Homelander couldn't defend against. It's a thrilling and decisive moment.