The short answer is no. The long answer is NNNNNNNNNOOOOOOOOO.
Kirby is the cute and cuddly puff ball that ****************, and requires you to get a doctor to pull it out.
It's like putting shotguns in Pokemon; it would contradict the series' appearance from the last few games.
Besides, how can you make Kirby dark to begin with?
All you can do to make Kirby dark while still having a Kirby game is making the textures more grainy, dark, and ugly, just like those FPS on the recent generation consoles. If you gave Kirby an actual knife that made enemies bleed, the game would not be Kirby. If you had King Dedede hanging people (which I think would be a cool thing), the game wouldn't be Kirby.
If you had gunfights, drunken barfights, chaotic battlefields, and a beelzebub cult, the game wouldn't be Kirby.