This randomised, parallel-group clinical trial evaluates the effects of the Unified Protocol (UP), a transdiagnostic cognitive-behavioural psychotherapy, on dimensional symptom outcomes aligned with the Hierarchical Taxonomy of Psychopathology (HiTOP) and on related temperamental/personality traits in adults with emotional disorders. Participants are randomly assigned (1:1:1) to UP, treatment as usual (TAU), or a waitlist (WL). Outcomes are assessed at baseline and after approximately 14 weeks. A planned follow-up assessment approximately 3 months after treatment completion is collected in the UP arm only.