Dark: (
Style) Titles that are dismal or gloomy in nature qualify for this category.
Fighting: (
Story/Location) Series whose primary focus is fighting would fit into this segment. (More precise) Subgenres include "
Gun-Action", "
Martial Arts" and "
Swordplay".
Friendship: (
Story/Location) Titles in which the relationship of two or more characters as friends are important.
Modern: (
Setting) These are titles which have a modern feel to them; the story takes place in the present day (of the creation of this anime), give or take a few years.
