Research on deviant behavior has often focused on the personality. Empirical studies have demonstrated that offenders differ from nonoffenders on a number of personality traits. The current study examined whether distinct adaptive styles and related personality traits were present within a sample of 105 serious juvenile offenders under the guardianship of the California Youth Authority. Also probed in this study was whether there were differences within and between male and female subsamples and whether distinct personality profiles were related to variations in the level of delinquent involvement. Participants completed questionnaires that measured social-emotional characteristics and self-reported levels of deviant behavior. Specific measurement instruments completed by the participants included the 62-item Weinberger Adjustment Inventory and the Kaufman Brief Intelligence Test. Results of various statistical analyses revealed significant relationships between distress and restraint in predicting deviant behavior. This finding did not vary by gender. However, results also indicated that female offenders were more likely to exhibit internalizing symptoms, such as high levels of distress, than were their male counterparts. Moreover, not only did serious girl offenders internalize more than serious boy offenders, they were also equally likely to externalize. This finding may indicate that low restraint may be an important risk factor for serious offending among girls. The use of socio-emotional measures and distinct profiles may help to target treatment programming to the specific needs of offenders and may also lead to more effective interventions. Limitations of the study include a limited sample from one location and a focus on a relatively narrow age group (14 to 19 years). Tables, references