Baka and Test. It has been on Netflix for a while. Very colorful anime that is at times disarmingly simplistic. But in reality some of the tactics used are quite good. It receives attention as a result of the girls in the anime. Not too sure if it evolves from just a harem anime.
Sankarea. Such a difficult anime. Difficult to place into words for the most part. At times I feel that it can be easily classified and brushed into a category. But I just have never seen an anime where a zombie lives normally but with the actual problems that come with being dead.