What kind of person donates part of their liver?

The driver for most people who anonymously donate part of their liver to a complete stranger is simply the wish to do a good deed, Canadian researchers report.
Their study included 50 people who underwent operations to provide liver tissue for transplants to either adults or children on waiting lists between 2005 and 2017.
Of the 50, 26 were interviewed and answered a personality questionnaire.
The researchers found donors scored higher than the general population for agreeableness and conscientiousness, and lower than normal for neuroticism.