As desires are varying and unlimited, the creation of forms as bodies will also be innumerable and eternal. We can say that here the thought of hatred present in many people in minor degree has reincarnated in its strongest form. The desires may make a person a saint or a robber, selfish or selfless, happy or miserable. The unending permutations and combinations of overt or covert desires produce variety of characters and personalities. When we accept mind as subtle matter or energy - like light and radiation, we can understand that the mind as 'subatomic particles' would exist even after death of an individual.
Creation is merely a change in appearance.
And after death we will not disappear in 'nothing'. The mental tendencies would continue to live even after the body is cremated or buried. We continue to exist as thought-waves even after death. Even though a thought, a desire, or a tendency may remain suppressed for many years it will not be destroyed, and sooner or later it will find its expression in a body form. Depending upon the nature of desire, the objectified form would be of a sub-human species or a human being.