Claymore is one of the darker series airing this season. I believe two episodes have aired thus far, and both lead me to believe that this will be one amazing series. It doesn't have much intentional comedy, or anything other then serious subject matter. The artwork and colouring of the series give it a certain mood and atmosphere that alone will send a certain chill down your spine. Each episode is packed with emotion, as well, and I'm sure this will be a tearjerker in the end. I can sense some strong psychological drama coming along down the road.
Elfen Lied is older (August 2005 was it?) but by far one of my favorite series. It's brutally dark, intriguing, psychological, and of course - packed with gore. It's brilliantly animated, and the music is also rather high-end. Quality.
I want to check out Red Garden now, so thanks to those that suggested it in this thread.
