This article quantifies differences in personality skills (Big Five Factor, locus of control, reciprocity, life goals and risk) and their assimilation rate between first-generation immigrants and native Germans, using the SOEP survey. The results reveal that the two groups differentiate in their personality traits but immigrants do not tend to assimilate natives during their stay. The Oaxaca-Blinder decomposition suggests that these skills contribute to explain around ten and seven percent of the wage gap, respectively for males and females.