The theme, characteristics, or interpersonal impact of an avatar may be closely associated with one of these specific types.
narcissistic - themes of power, status, perfection, grandiosity; draws for admiration and praise; feelings of being "special" and "privileged"
schizoid - themes of interpersonal detachment and indifference, perhaps combined with evidence of abstract or intellectual thinking; little evidence of warmth and tenderness; the "loner" themes
paranoid - distrust, isolation, hypervigilance, blaming or finding fault with others; cold, humorless, argumentative characteristics
depressive - gloom, darkness, loss, low self-esteeem
manic - energtic, grandiose, impulsive
masochistic - self-destructive, themes revolving around the "bad self" or "woe is me"
obsessive/compulsive - seriouis, formal; themes of control and perfection; shows evidence of a concern about details and rules
psychopathic - antisocial, violates rules; little evidence of shame or guilt; takes advantage of others; possible superficial friendliness or charm
histrionic - attention-seeking and seductive in flavor, dramatic, emotional, vain; themes involving dependency
schizotypal - themes of being aloof, indifferent; evidence of magical thinking or superstitious beliefs; peculiar characteristics
Like masks of any kind, avatars hide and reveal at the same time. Behind it, people can conceal some personal things about themselves, but the av also selectively amplifies other aspects of their personalities. It may reveal something about the member that otherwise is not immediately obvious - maybe not even obvious if you met that person in real life. Maybe not even obvious to the owners themselves. What users express in their props is not always a conscious choice. Sometimes it's unconscious. People may simply say that they are wearing a particular av because "I like it." When asked, they're not sure what it says about them. But other people may know.
As for my avatar, it has a truly deep, psychological reference. If you intensely focus on it's center with your eyes for 22 minutes at 2:00 GMT on even number days, it will shed some light into it's true meaning.
Hope this helps. :scared