"The first in the series, fully titled Darkstalkers - The Night Warriors or Vampire - The Night Warriors in Japan and released in 1994, features ten playable characters (Demitri Maximoff, Jon Talbain, Victor von Gerdenheim, Lord Raptor, Morrigan Aensland, Anakaris, Felicia, Oboro Bishamon, Rikuo and Sasquatch) and two non-playable boss characters (Huitzil and Pyron) as the final opponents in the single-player mode.
The game features the same gameplay system Capcom developed for the Street Fighter II series, but with several new gameplay features such as Air Blocking, Crouch Walking and Chain Combos. The game featured a Special meter similar to the "Super Combo" gauge" in Super Street Fighter II Turbo, which the player could fill up to perform a super powered special attack. Unlike the Super Combo gauge in Super Turbo, the Special in Darkstalkers gradually drains unless the player performs their super move, preventing players from preserving their super moves for later use."
Source: Wikipedia, Darkstalkers , available under the CC-BY-SA License.