Codependent Personality Disorder is a dysfunctional relationship with the self characterized by living through or for another, attempts to control others, blaming others, a sense of victimization, attempts to "fix" others, and intense anxiety around intimacy. It is very common in people raised in dysfunctional families, and in the partners and children of alcoholics and addicts.  Most chemical dependency treatment centers now also offer treatment for Codependency. Codependency has been applied to individuals who suffer from constantly focusing on the needs and behaviors of others. Codependent individuals become so preoccupied and focused on the needs of others that they neglect their own needs.

Due to the broad definition of codependency, identifying a codependent individual can be a chore. Some common characteristics of codependency are as follows:

• care taking
• low self esteem
• repression
• obsession
• controlling
• denial
• dependent
• poor communicators
• establish weak boundaries
• lack of trust
• anger
• sexual problems

Codependency has a tendency to mask itself through characteristic personality roles. Many codependents portray one or a combination of the following roles:

• rescuers
• fixers
• people pleasers
• overachievers
• failures
• perfectionists
• victims
• martyrs
• addicted ones
• compulsive ones
• grandiose ones
• selfish ones
• bullies
• abusers
• lost children
• comedians

SOURCES:
http://www.recovery-man.com/coda/codependency.htm
http://www.umkc.edu/sites/hsw/codepend/

Another informative site on Codependency is:
Soul Self Help