News casting

Recently, I watched a talk show in a TV channel where eminent newscasters shared their views. The basic requirements to be a newscaster, they say, is the look, personality, ability to present, smart in all senses, updated with everything around the world, and last but not the least, a capable person who can handle any unforeseen situation.
One thing that strikes me regularly while watching news in any private TV channel is that the presenters remain very stiff and formal. If they remain normal, they would look more natural, just as we see in BBC or CNN.
Mahbuba Sharmeen Preema, Penfield School, Dhaka