Kenpuu Denki Berserk, Gantz Recommendations
Blood.Gore.Unfairness. both are packed with those ,and will leave you depressed for a rather long time.
both are a must see
Blood, Gore, Action and Greatness.
Blood, guts, and gore baby!!!!!
Gantz and Berserk are very similar anime or manga at least. They're similar in the way that they don't cover nearly as much as the manga does. I highly recommend giving these two a read or a watch. They're extremely violent, gory with strong characters and themes. My personal favorites from each series are Kaze aka Muscle Rider or Guts. Not for the faint of heart