In my opinion the CEO has to be the inspirational and defining leader of the company. They have to embody what the core of the company is and bring the vision to life. Here’s 6 things on a basic level that you have to be able to do.

Inspirational. You have to motivate and inspire your entire company and get everyone to buy into the vision. You are the inspirational leader.
Be a strategist. You have to create a great strategy, know the marketplace and keep your company competitive.
Ability to create the culture. You are the face of the company and you need to create the culture that defines your mission. Positive, forward thinking and driven.
Be a decision maker. Be ready to take risks and make countless decisions in various areas of the company with the input of department executives.
Money skills. You need to make sure there is money in the bank, spend wisely and ensure you keep the company on a strong footing.
Leadership. Accept responsibility and ownership that you are the one guiding the ship and do the best of your ability at all times, make every decision in the best interests of the company and do the right thing.