Depending on the event and the designer, the catwalk can vary. High fashion runway models are there to present the designers fashion, not themselves, so there is no personality required from the model. It is a basic, stoic walk. Whereas if it's a local fashion show and is accompanied with variety then it will require a fun personality to go along with the show.
Women walk with their hips, men walk with their shoulders. Movement in how we walk tells a lot about our personality.