Depression: (
Story/Location) Titles that contain characters who suffer from depression would fall into this category if this is of significant importance for the storyline.
Suspense: (
Genre) An anime title that gives you a "pleasant excitement as to a decision or outcome" should be in this classification.
Soul Mates: (
Story/Location) Mentioned only in terms of extreme romantic entanglements, there are situations in which two people (or souls) are destined (or pre-destined) to have a strong emotional attraction or involvement.
Violent: (
Objectionable Content)
Titles that include as an important part of their content excessive displays of cruelty, blood and gore. Any of the classical 'slasher' films would qualify for this keyword. The series
Black Lagoon would be a good example; as many of its chapters involve killer lolis, chainsaw mercenaries and flying body parts.