Character is the mental and moral qualities distinctive to a individual - when we become our New Creation thru the Cross of Christ we travel from death into life and the new character He develops in us is in the disposition of Christ.
Whereas personality is the uniqueness of our person found in the disposition of Christ Jesus. It becomes the combination of characteristics or qualities that form an individual who is now in Christ's distinctive character and demeanor.
God gives us each a gift and it is in this, as well, that we serve the body of Christ as a whole. Many serve God in many ways thru mercy and grace, but He gives us a specific gift to add to the body of Christ.