i remember that it was a novel on royalroad which was about the son of a mafia family who was a beta tester of a vrmmorpg and he had a rare class (white hair, and spikes coming out of places like his elbows) but the thing i liked the most was that he was a vampire in real life.
Are you sure it was a vampire? Because I remember a story from a couple years back about a bio-enhanced kid who was part of a mafia, and played a vrmmorpg. Close, but not quite.
Unfortunately, this story was taken down by the author. However I do remember that the mc had a Pet Dragon, and an ego weapon, which were his real life Butler and maid. Does that sound familiar?