Question: Should I include any of my personal habits in the answer?
You can include personal habits but do not mention something too personal which can be considered unprofessional to the interviewer. Always keep the job profile in focus. Like do not mention about your habit of waking up early, unless your job is an early morning shift.
Question: What to do if I don't have any such qualities or habits?
In such a case, you can tell the interviewer that there is no such thing and that you have included all your qualities in your resume. However this is not recommended, you should always try to answer something like handling an unexpected situation or completing any goal.