What is so special about Lord Krishna?

Even to this day, we find that people are attracted towards many Mahatmas like Sri Ramakrishna Paramahamsa, Mother Saradamani, Swami Vivekananda, Sri Ramana Maharshi, so on and so forth. Without these incarnations, it would not have been possible to understand the greatness of faith, devotion, worship and the fact that God can be realized. All Incarnations are also being ‘powered’ by the infinite force called God.
The God took many incarnations like Matsya, Kurma etc. These were ‘aavesha avataras’ taken for a specific purpose. God – the infinite force itself has come down with all Sodhasa kalas (16 aspects) as Lord Krishna. so he is Poornavatar (the wholesome incarnation). If you think of Lord without any attributes as Brahman, that is Krishna. So He is the supreme.