The Assertive Personality
A persona which can speak clearly and precisely can only be achieved by careful pre-thought. By definition the assertive personality is one which exhibits assertiveness.
Pre-thought requires time spent in meditation and also the review of material concerned with a particular body of knowledge. Extensive discussions with other people are all important.
In communication with other people and regarding speech, the diction and level of volume should be motivating and interesting. The written word might be considered in terms of essays and even a book. Pictures have a relevance, with the development around a focal point.