A conceptual model on the trait–psychopathology relationship proposed a unifying model of personality, Axis I and Axis II disorders (Krueger, 2005). The current study explores the relevance of this model for the obsessive–compulsive (OC) field in 344 adolescents (61% girls; 12–20 years old) from referred and population samples and examines how personality predicts different OC-related symptoms, comparing the relative contribution of maladaptive and general personality traits. Further, this study explores whether some OC symptoms are more related to specific OCPD traits. Hierarchical regressions reveal that childhood personality can differentially predict OC symptoms and OCPD traits. Results also show that personality-related OC symptoms, as well as the OCPD traits, can be incrementally predicted by maladaptive personality measures. Pearson correlations reveal that certain OC symptoms are more related to specific OCPD traits. Hence, the importance of including both general and maladaptive personality measures in the assessment of developmental psychopathology will be discussed.