Question

What are important individuals of the ottoman empire

Answer 1

For one, they pretty much destroyed the Byzantine empire. The Byzantine empire should more accurately be called The Christian East Roman Empire. When people talk about the fall of the Roman Empire, they are talking about the fall of the West Roman Empire. The East never fell until Constantinople fell to the Muslim Turks with the help of some of the first siege cannons in history.
Besides having very large Cannons early on, the Ottoman empire employed possibly the first soldiers in history to utilize guns as their primary weapons.

Answer 2

Do you mean important people or important things that happened when it was established. :)