Several personality or character traits can increase a person's propensity for suicide. Impulsivity – a trait measured on psychological tests which tends to characterize men more than it does women – can exacerbate the suicide problem. (Springen, 2010) Other inquiries have found that having a lower intelligence raises the odds that a person will commit suicide. (Deary, Weiss & Batty, 2011) Yet it's also true that a number of people who commit suicide are highly intelligent.
One of the most powerful personality traits associated with suicide is high sensitivity. It's estimated that around 20% of the population can be classified as highly sensitive, which means that not only do they react to social hurts in a more personal way, but they are often more attuned to and bothered by the suffering of others. Therefore highly sensitive people can find themselves more preoccupied with the problems in the world, which can fuel a state of despair.
Borderline personality disorder (BPD), a condition based on hypersensitivity in which people are quick to overreact to the slightest injuries (think about it as someone with skin so thin that they writhe in pain over the slightest touch), is a condition frequently associated with suicide. It's estimated that as many as 1 in 10 patients diagnosed with BPD will eventually kill themselves.
Finally, another major suicide risk is sexual identity issues. Gay, lesbian, bisexual or transgender citizens all have much higher suicide rates than the general public, and sexual identity issues are by far the leading contributor to suicides among teens and youth.