He has a need to hunt down people and cut them into pieces so I'm thinking he is probably more than OCDish.

[Schizoid Personality Disorder]

A. A pervasive pattern of detachment from social relationships and a restricted range of expression of emotions in interpersonal settings, beginning by early adulthood and present in a variety of contexts, as indicated by four (or more) of the following:

• neither desires nor enjoys close relationships, including being part of a family
• almost always chooses solitary activities
• has little, if any, interest in having sexual experiences with another person
• takes pleasure in few, if any, activities
• lacks close friends or confidants other than first-degree relatives appears indifferent to the praise or criticism of others
• shows emotional coldness, detachment, or flattened affectivity

B. Does not occur exclusively during the course of Schizophrenia, a Mood Disorder With Psychotic Features, another Psychotic Disorder, or a Pervasive Developmental Disorder and is not due to the direct physiological effects of a general medical condition.