Sundown

“I like to take a bite out of life.”

Vampire!
By day, he is an entrepreneurial playboy-type investor who provides funds for scientists working on super-hero–style technology and/or weapons. i.e. Dr. Max Schmall. He is not a scientist himself. He is the President of Sundown Inc.
By night he fights crime and preys on those that prey on others.

Originally a vampire-hunter who fought in the valley of the ancient Romania, where the Tournament's Ki-Char soldiers recently resided. Their ancestors fought to destroy the vampires in the Ancient Tournament alongside the immortals.
He was bit for the final time before the Ki-Char's ancestors unleashed their most powerful weapon and wiped out the vampires forever... at least so they thought.
Many friends that they considered allies soon come to possess the hunger, power, and sensations of the vampires they fought to destroy!
Rather than giving in to his lust for blood Sundown fought to control his appitites by creating an armored suit that cut his teeth off from the outside world and the innocents that surrounded him. The helmet also works to filter smells that might trigger any sudden bursts of blood-lust.
As a vampire, a character originally created to be evil in its most potent form, he is deathly allergic to all forms of positive energy, including water, sunlight, wood, fire, and anti-oxidents (garlic). His suit also works to protect him from these harsh elements.
Hiding behind the guise of an armored superhero, who is powered by the strength of his suit, Sundown continues to do what he began as... hundreds of years later: a vampire hunter!

He eventually joins Death Watch in his hunt for Blood Prowlers, who are a competition to Sundown. Sundown discovers that he can bite/feed off of the Blood Prowlers before they can drain him of his own juices. If he can drain them before they drain him he can kill them with little damage to the body. That is of great worth to Death Watch-a good kill with minimal damage means a lot of money.